129-536: Bihar State Power Holding Company Limited ( BSPHCL ), formerly Bihar State Electricity Board ( BSEB ) is a state-owned electricity regulation board operating within the state of Bihar in India. BSEB was established in 1958 as a statutory corporation under the Electricity (Supply) Act, 1948. As of November 2012, BSEB has nearly 1,700 officers and 14,850 employees. The derated capacity comes to just 530 MW. The BSEB
258-455: A conductor 's surface, since otherwise there would be a force along the surface of the conductor that would move the charge carriers to even the potential across the surface. The electric field was formally defined as the force exerted per unit charge, but the concept of potential allows for a more useful and equivalent definition: the electric field is the local gradient of the electric potential. Usually expressed in volts per metre,
387-461: A force on each other, an effect that was known, though not understood, in antiquity. A lightweight ball suspended by a fine thread can be charged by touching it with a glass rod that has itself been charged by rubbing with a cloth. If a similar ball is charged by the same glass rod, it is found to repel the first: the charge acts to force the two balls apart. Two balls that are charged with a rubbed amber rod also repel each other. However, if one ball
516-737: A magnetic field . In most applications, Coulomb's law determines the force acting on an electric charge. Electric potential is the work done to move an electric charge from one point to another within an electric field, typically measured in volts . Electricity plays a central role in many modern technologies, serving in electric power where electric current is used to energise equipment, and in electronics dealing with electrical circuits involving active components such as vacuum tubes , transistors , diodes and integrated circuits , and associated passive interconnection technologies. The study of electrical phenomena dates back to antiquity, with theoretical understanding progressing slowly until
645-409: A steady state current, but instead blocks it. The inductor is a conductor, usually a coil of wire, that stores energy in a magnetic field in response to the current through it. When the current changes, the magnetic field does too, inducing a voltage between the ends of the conductor. The induced voltage is proportional to the time rate of change of the current. The constant of proportionality
774-467: A $ 16.9 billion offer, comprising a $ 13.5 billion value plus $ 3.4 billion cash. On 5 May, GE offered to buy one-fourth of the shares in Alstom's Indian power and distribution companies – Alstom T&D India and Alstom India – at 261.25 and 382.20 rupees a share (value US$ 278 million and $ 111 million respectively) subject to its bid for Alstom SA being successful. On 5 May 2014,
903-574: A 2003 deal in Indonesia valued at $ 118 million in particular. On April 13, 2013, Alstom senior executive Frédéric Pierucci was arrested at the John F. Kennedy International Airport in New York . He was accused of willful blindness of his company's suspected corruption and was imprisoned in a high security facility for 14 months and denied release on bail until the week of Alstom's acquisition by
1032-538: A 51% shareholding in Linke-Hofmann-Busch from Salzgitter AG . In 1995, the company acquired the remaining shares in the steam turbine manufacturer MAN Energie . In early 1998, GEC Alsthom acquired the electrical contractor Cegelec , renaming it Alstom Power Conversion . In 1998, GEC Alsthom bought Italian firm SASIB 's rail signalling subsidiary Sasib Railways , which included the former General Railway Signal (USA). In June 1998, GEC Alsthom
1161-432: A charge of Q coulombs every t seconds passing through an electric potential ( voltage ) difference of V is where Electric power is generally supplied to businesses and homes by the electric power industry . Electricity is usually sold by the kilowatt hour (3.6 MJ) which is the product of power in kilowatts multiplied by running time in hours. Electric utilities measure power using electricity meters , which keep
1290-453: A coal handling plant for a 3 x 660MW coal-based super thermal power project coming up at Nabinagar. The coal handling plant will be designed to run at a capacity of 3,630 tons per hour. In March 2013, Alstom was awarded a contract worth approximately $ 115 million by BHEL, to supply components for three units of 660 MW supercritical boilers of NPGCL. Alstom India will supply transformers for NTPC's Supercritical Nabinagar Power Project, by winning
1419-516: A common reference point to which potentials may be expressed and compared is useful. While this could be at infinity, a much more useful reference is the Earth itself, which is assumed to be at the same potential everywhere. This reference point naturally takes the name earth or ground . Earth is assumed to be an infinite source of equal amounts of positive and negative charge and is therefore electrically uncharged—and unchargeable. Electric potential
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#17327803826751548-520: A consortium of Alstom ( Alstom Wind ), EDF , and DONG Energy was awarded three major French offshore wind farm contracts, the company initiated construction of factories at Cherbourg-en-Cotentin (turbine blades in association with LM Power , also wind turbine towers) and Saint-Nazaire (Nacelles and generators). Also in 2012, the company formed a joint venture with RusHydro to manufacture hydropower equipment for small and medium power hydropower plants. (up to about 100MW.) Late in 2012, to further
1677-472: A current of one amp. The capacitor is a development of the Leyden jar and is a device that can store charge, and thereby storing electrical energy in the resulting field. It consists of two conducting plates separated by a thin insulating dielectric layer; in practice, thin metal foils are coiled together, increasing the surface area per unit volume and therefore the capacitance . The unit of capacitance
1806-494: A dampened kite string and flown the kite in a storm-threatened sky . A succession of sparks jumping from the key to the back of his hand showed that lightning was indeed electrical in nature. He also explained the apparently paradoxical behavior of the Leyden jar as a device for storing large amounts of electrical charge in terms of electricity consisting of both positive and negative charges. In 1775, Hugh Williamson reported
1935-559: A design flaw inherited from the acquisition of ABB 's turbine business, in addition to losses in other business sectors. In 2014, General Electric (GE) announced that it reached a deal to purchase Alstom's power and grid divisions for US$ 17 billion (€12.4 billion). The deal came under heavy scrutiny from French regulators who saw the business as a strategically important domestic industry. To secure approval, GE agreed to form joint ventures with French companies in power generation and transmission, Alstom's heavy gas turbine business
2064-403: A further 10% stake from shareholder Bouygues and an option to form a rail transport joint venture. On 19 June, GE revised its bid, matching the same price with a lower cash transaction value; it also proposed forming a joint venture of their renewable, electric grid, steam turbine and nuclear power businesses. GE announced a memorandum of understanding between the two firms in the rail sector and
2193-593: A greater product overlap and thus a greater risk to jobs, along with potential issues with EU competition regulators. Siemens' offer was characterised as "defensive", being skeptically received by investors and analysts. On 29 April, Reuters reported that Alstom's board had accepted a €10 billion bid by GE for its energy division; In a letter from GE executive Jeffrey R. Immelt to President François Hollande published in Les Echos , Immelt gave assurances about continued investment in Alstom's French activities,
2322-468: A joint venture of Alstom and Gibela began construction of a new 60,000 square metres (650,000 sq ft) train building factory in Dunnotar , outside of Johannesburg , South Africa . Initial orders for the factory included 580 X'Trapolis Mega passenger trains for Passenger Rail Agency of South Africa under a €4 billion contract that was awarded in 2013. In September 2016, Alstom announced it
2451-425: A large lightning cloud may be as high as 100 MV and have discharge energies as great as 250 kWh. The field strength is greatly affected by nearby conducting objects, and it is particularly intense when it is forced to curve around sharply pointed objects. This principle is exploited in the lightning conductor , the sharp spike of which acts to encourage the lightning strike to develop there, rather than to
2580-402: A millimetre per second, the electric field that drives them itself propagates at close to the speed of light , enabling electrical signals to pass rapidly along wires. Current causes several observable effects, which historically were the means of recognising its presence. That water could be decomposed by the current from a voltaic pile was discovered by Nicholson and Carlisle in 1800,
2709-553: A more reliable source of electrical energy than the electrostatic machines previously used. The recognition of electromagnetism , the unity of electric and magnetic phenomena, is due to Hans Christian Ørsted and André-Marie Ampère in 1819–1820. Michael Faraday invented the electric motor in 1821, and Georg Ohm mathematically analysed the electrical circuit in 1827. Electricity and magnetism (and light) were definitively linked by James Clerk Maxwell , in particular in his " On Physical Lines of Force " in 1861 and 1862. While
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#17327803826752838-425: A positive current is defined as having the same direction of flow as any positive charge it contains, or to flow from the most positive part of a circuit to the most negative part. Current defined in this manner is called conventional current . The motion of negatively charged electrons around an electric circuit , one of the most familiar forms of current, is thus deemed positive in the opposite direction to that of
2967-891: A practical generator, but it showed the possibility of generating electric power using magnetism, a possibility that would be taken up by those that followed on from his work. An electric circuit is an interconnection of electric components such that electric charge is made to flow along a closed path (a circuit), usually to perform some useful task. The components in an electric circuit can take many forms, which can include elements such as resistors , capacitors , switches , transformers and electronics . Electronic circuits contain active components , usually semiconductors , and typically exhibit non-linear behaviour, requiring complex analysis. The simplest electric components are those that are termed passive and linear : while they may temporarily store energy, they contain no sources of it, and exhibit linear responses to stimuli. The resistor
3096-406: A process now known as electrolysis . Their work was greatly expanded upon by Michael Faraday in 1833. Current through a resistance causes localised heating, an effect James Prescott Joule studied mathematically in 1840. One of the most important discoveries relating to current was made accidentally by Hans Christian Ørsted in 1820, when, while preparing a lecture, he witnessed the current in
3225-477: A proposal to merge with Siemens Mobility , the rolling stock division of German conglomerate Siemens ; this merger was promoted as the creation of "a new European champion in the rail industry". The combined rail business, which was to have been reportedly named Siemens Alstom and headquartered in Paris, would have $ 18 billion U.S. in revenue and employ 62,300 people in more than 60 countries. During November 2018,
3354-471: A rapidly changing one. Electric power is the rate at which electric energy is transferred by an electric circuit . The SI unit of power is the watt , one joule per second . Electric power, like mechanical power , is the rate of doing work , measured in watts , and represented by the letter P . The term wattage is used colloquially to mean "electric power in watts." The electric power in watts produced by an electric current I consisting of
3483-599: A reported cost of €54 million. As a consequence of an alignment agreement between Transmashholding and another entity, LocoTech-Service , Alstom's stake in the former decreased to 20% in August 2018. In 2011, Alstom and the Iraqi government signed a memorandum of understanding regarding the construction of a new high-speed rail line between Baghdad and Basra . In 2012, Alstom opened construction of factories at Sorel-Tracy , Quebec, Canada (passenger rail vehicles). After
3612-489: A resistance is directly proportional to the potential difference across it. The resistance of most materials is relatively constant over a range of temperatures and currents; materials under these conditions are known as 'ohmic'. The ohm , the unit of resistance, was named in honour of Georg Ohm , and is symbolised by the Greek letter Ω. 1 Ω is the resistance that will produce a potential difference of one volt in response to
3741-595: A running total of the electric energy delivered to a customer. Unlike fossil fuels , electricity is a low entropy form of energy and can be converted into motion or many other forms of energy with high efficiency. Electronics deals with electrical circuits that involve active electrical components such as vacuum tubes , transistors , diodes , sensors and integrated circuits , and associated passive interconnection technologies. The nonlinear behaviour of active components and their ability to control electron flows makes digital switching possible, and electronics
3870-431: A scientific curiosity into an essential tool for modern life. In 1887, Heinrich Hertz discovered that electrodes illuminated with ultraviolet light create electric sparks more easily. In 1905, Albert Einstein published a paper that explained experimental data from the photoelectric effect as being the result of light energy being carried in discrete quantized packets, energising electrons. This discovery led to
3999-575: A series of experiments to the Royal Society on the shocks delivered by the electric eel ; that same year the surgeon and anatomist John Hunter described the structure of the fish's electric organs . In 1791, Luigi Galvani published his discovery of bioelectromagnetics , demonstrating that electricity was the medium by which neurons passed signals to the muscles. Alessandro Volta 's battery, or voltaic pile , of 1800, made from alternating layers of zinc and copper, provided scientists with
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4128-515: A series of observations on static electricity around 600 BCE, from which he believed that friction rendered amber magnetic , in contrast to minerals such as magnetite , which needed no rubbing. Thales was incorrect in believing the attraction was due to a magnetic effect, but later science would prove a link between magnetism and electricity. According to a controversial theory, the Parthians may have had knowledge of electroplating , based on
4257-455: A set of equations that could unambiguously describe the interrelationship between electric field, magnetic field, electric charge, and electric current. He could moreover prove that in a vacuum such a wave would travel at the speed of light , and thus light itself was a form of electromagnetic radiation. Maxwell's equations , which unify light, fields, and charge are one of the great milestones of theoretical physics. Alstom Alstom SA
4386-477: A solid crystal (such as a germanium crystal) to detect a radio signal by the contact junction effect. In a solid-state component, the current is confined to solid elements and compounds engineered specifically to switch and amplify it. Current flow can be understood in two forms: as negatively charged electrons , and as positively charged electron deficiencies called holes . These charges and holes are understood in terms of quantum physics. The building material
4515-408: A total capacity of 3300 MW with projects of 1980 MW under construction. The project comprises two stages. The EPC contractor for State-1 of 1,980MW (3x660 MW) is Russian firm TPE , and for Stage-2 of 1,320MW (2x660 MW) is BHEL . Stage-1 being built with equipment from TPE is delayed as TPE is asking for more money. In November 2013, 660 MW unit 4 of Stage-2 being built by BHEL got synchronized with
4644-560: A variant of their TGV family specially designed for traversing the Channel Tunnel between the UK and France. Although collectively operated by Eurostar , the type was ordered by three different railway companies: 16 by SNCF , four by NMBS/SNCB , and 18 by British Rail , of which seven were shortened North of London sets. The first Class 373 set was completed at GEC Alstom's Belfort facility during 1992. In 1994, GEC Alsthom acquired
4773-511: A wire disturbing the needle of a magnetic compass. He had discovered electromagnetism , a fundamental interaction between electricity and magnetics. The level of electromagnetic emissions generated by electric arcing is high enough to produce electromagnetic interference , which can be detrimental to the workings of adjacent equipment. In engineering or household applications, current is often described as being either direct current (DC) or alternating current (AC). These terms refer to how
4902-448: A wire suspended from a pivot above the magnet and dipped into the mercury. The magnet exerted a tangential force on the wire, making it circle around the magnet for as long as the current was maintained. Experimentation by Faraday in 1831 revealed that a wire moving perpendicular to a magnetic field developed a potential difference between its ends. Further analysis of this process, known as electromagnetic induction , enabled him to state
5031-402: A wire. The informal term static electricity refers to the net presence (or 'imbalance') of charge on a body, usually caused when dissimilar materials are rubbed together, transferring charge from one to the other. Charge can be measured by a number of means, an early instrument being the gold-leaf electroscope , which although still in use for classroom demonstrations, has been superseded by
5160-401: A €700 million deal), refocused on rail transport. Due to the acquisition, GE accrued $ 17.3bn of goodwill, consisting of Alstom's negative book value of $ 7.2bn at the time of acquisition and the $ 10.1bn purchase price. In October 2018, GE wrote-off $ 23bn from the value of its power industry division, largely attributed to the Alstom purchase. In November 2015, Alstom was awarded a contract by
5289-631: A ₹105 crore order that covers design, engineering, manufacture, supply, testing, erection and commissioning of generator transformers and associated power transformers and shunt reactor. The Nabingar power transformer package is due to be delivered by October 2017. The current installed capacity of this power plant is 750 MW and in future the plant will have a total capacity of 1000 MW with projects of 250 MW under construction. Koshi Hydel Power Station which has an installed capacity of 19.2 MW (4x4.8) has been handed over to Bihar State Hydel Power Corporation on 11 November 2003. Bihar Grid Company Limited (BGCL)
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5418-401: Is 470 MW and in future the plant will have a total capacity of 720 MW with projects of 250 MW under construction. Unit No. 1, 2 & 3 of 15 MW each and Unit No. 4 & 5 of 50 MW each are retired as they are very old to be maintained and are retired. Unit 6 and 7 of 110 MW each were renovated by BHEL which also originally supplied equipments and are now operational. New Unit 8 of 250 MW
5547-410: Is 660 MW and in future the plant will have a total capacity of 4380 MW with projects of 3720 MW under construction. Nabinagar Power Generation Company Ltd (NPGCL), a 50:50 joint venture of NTPC Ltd and BSEB, is setting up the 4,380 MW (660 MW X 3), which will start generating electricity from December 2017. The project's generation capacity initially was to be 3960 MW but in 2016, the production capacity
5676-584: Is a scalar quantity . That is, it has only magnitude and not direction. It may be viewed as analogous to height : just as a released object will fall through a difference in heights caused by a gravitational field, so a charge will 'fall' across the voltage caused by an electric field. As relief maps show contour lines marking points of equal height, a set of lines marking points of equal potential (known as equipotentials ) may be drawn around an electrostatically charged object. The equipotentials cross all lines of force at right angles. They must also lie parallel to
5805-411: Is a vector field . The study of electric fields created by stationary charges is called electrostatics . The field may be visualised by a set of imaginary lines whose direction at any point is the same as that of the field. This concept was introduced by Faraday, whose term ' lines of force ' still sometimes sees use. The field lines are the paths that a point positive charge would seek to make as it
5934-547: Is a French multinational rolling stock manufacturer which operates worldwide in rail transport markets. It is active in the fields of passenger transportation, signaling, and locomotives, producing high-speed, suburban, regional and urban trains along with trams. The company and its name (originally spelled Alsthom) was formed by a merger between the electric engineering division of Société Alsacienne de Constructions Mécaniques (Als) and Compagnie Française Thomson-Houston (thom) in 1928. Significant acquisitions later included
6063-514: Is a joint venture of Bihar State Power Holding Company Limited (BSPHCL) and Power Grid Corporation to expand and strengthen electricity transmission in Bihar . There are 45 power sub-stations. The eight grids supply around 500MW of power to the state capital. There are six grid substations in North Bihar. Upcoming Bihar thermal power plants: The Government of India has decided to reduce
6192-452: Is an important difference. Gravity always acts in attraction, drawing two masses together, while the electric field can result in either attraction or repulsion. Since large bodies such as planets generally carry no net charge, the electric field at a distance is usually zero. Thus gravity is the dominant force at distance in the universe, despite being much weaker. An electric field generally varies in space, and its strength at any one point
6321-401: Is charged by the glass rod, and the other by an amber rod, the two balls are found to attract each other. These phenomena were investigated in the late eighteenth century by Charles-Augustin de Coulomb , who deduced that charge manifests itself in two opposing forms. This discovery led to the well-known axiom: like-charged objects repel and opposite-charged objects attract . The force acts on
6450-473: Is defined as negative, and that by protons is positive. Before these particles were discovered, Benjamin Franklin had defined a positive charge as being the charge acquired by a glass rod when it is rubbed with a silk cloth. A proton by definition carries a charge of exactly 1.602 176 634 × 10 coulombs . This value is also defined as the elementary charge . No object can have a charge smaller than
6579-483: Is defined as the force (per unit charge) that would be felt by a stationary, negligible charge if placed at that point. The conceptual charge, termed a ' test charge ', must be vanishingly small to prevent its own electric field disturbing the main field and must also be stationary to prevent the effect of magnetic fields . As the electric field is defined in terms of force , and force is a vector , having both magnitude and direction , it follows that an electric field
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#17327803826756708-531: Is integral to applications spanning transport , heating , lighting , communications , and computation , making it the foundation of modern industrial society. Long before any knowledge of electricity existed, people were aware of shocks from electric fish . Ancient Egyptian texts dating from 2750 BCE described them as the "protectors" of all other fish. Electric fish were again reported millennia later by ancient Greek , Roman and Arabic naturalists and physicians . Several ancient writers, such as Pliny
6837-522: Is located in Kahalgaon , Bhagalpur , Bihar . The current installed capacity of this power plant is 610 MW Units 1 & 2 of 110 MW, originally commissioned in 1985–86, went down in 2002–2003 and were renovated by Bharat Heavy Electricals who originally supplied equipment to these two units. Units 3 & 4 are of 195 MW each. The plant is also known as George Fernandes Thermal Power Plant Station. The current installed capacity of this power plant
6966-406: Is mediated by the magnetic field each current produces and forms the basis for the international definition of the ampere . This relationship between magnetic fields and currents is extremely important, for it led to Michael Faraday's invention of the electric motor in 1821. Faraday's homopolar motor consisted of a permanent magnet sitting in a pool of mercury . A current was allowed through
7095-415: Is most often a crystalline semiconductor . Solid-state electronics came into its own with the emergence of transistor technology. The first working transistor, a germanium -based point-contact transistor , was invented by John Bardeen and Walter Houser Brattain at Bell Labs in 1947, followed by the bipolar junction transistor in 1948. By modern convention, the charge carried by electrons
7224-403: Is perhaps the simplest of passive circuit elements: as its name suggests, it resists the current through it, dissipating its energy as heat. The resistance is a consequence of the motion of charge through a conductor: in metals, for example, resistance is primarily due to collisions between electrons and ions. Ohm's law is a basic law of circuit theory , stating that the current passing through
7353-436: Is related to magnetism , both being part of the phenomenon of electromagnetism , as described by Maxwell's equations . Common phenomena are related to electricity, including lightning , static electricity , electric heating , electric discharges and many others. The presence of either a positive or negative electric charge produces an electric field . The motion of electric charges is an electric current and produces
7482-531: Is subjected to transients , such as when first energised. The concept of the electric field was introduced by Michael Faraday . An electric field is created by a charged body in the space that surrounds it, and results in a force exerted on any other charges placed within the field. The electric field acts between two charges in a similar manner to the way that the gravitational field acts between two masses , and like it, extends towards infinity and shows an inverse square relationship with distance. However, there
7611-406: Is termed the inductance . The unit of inductance is the henry , named after Joseph Henry , a contemporary of Faraday. One henry is the inductance that will induce a potential difference of one volt if the current through it changes at a rate of one ampere per second. The inductor's behaviour is in some regards converse to that of the capacitor: it will freely allow an unchanging current, but opposes
7740-415: Is the farad , named after Michael Faraday , and given the symbol F : one farad is the capacitance that develops a potential difference of one volt when it stores a charge of one coulomb. A capacitor connected to a voltage supply initially causes a current as it accumulates charge; this current will however decay in time as the capacitor fills, eventually falling to zero. A capacitor will therefore not permit
7869-529: Is therefore 0 at all places inside the body. This is the operating principal of the Faraday cage , a conducting metal shell which isolates its interior from outside electrical effects. The principles of electrostatics are important when designing items of high-voltage equipment. There is a finite limit to the electric field strength that may be withstood by any medium. Beyond this point, electrical breakdown occurs and an electric arc causes flashover between
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#17327803826757998-409: Is usually measured in volts , and one volt is the potential for which one joule of work must be expended to bring a charge of one coulomb from infinity. This definition of potential, while formal, has little practical application, and a more useful concept is that of electric potential difference , and is the energy required to move a unit charge between two specified points. An electric field has
8127-536: Is widely used in information processing , telecommunications , and signal processing . Interconnection technologies such as circuit boards , electronics packaging technology, and other varied forms of communication infrastructure complete circuit functionality and transform the mixed components into a regular working system . Today, most electronic devices use semiconductor components to perform electron control. The underlying principles that explain how semiconductors work are studied in solid state physics , whereas
8256-456: The French : Constructions Électriques de France , Tarbes; a manufacturer of electric locomotives as well as electrical and hydraulic equipment. In 1969, Compagnie Générale d'Électricité (CGE) became the majority shareholder of Alsthom. In 1976, Alsthom merged with Chantiers de l'Atlantique , becoming Alsthom Atlantique. Thus, the business expanded into marine. The next year, it constructed
8385-721: The Neo-Latin word electricus ("of amber" or "like amber", from ἤλεκτρον, elektron , the Greek word for "amber") to refer to the property of attracting small objects after being rubbed. This association gave rise to the English words "electric" and "electricity", which made their first appearance in print in Thomas Browne 's Pseudodoxia Epidemica of 1646. Isaac Newton made early investigations into electricity, with an idea of his written down in his book Opticks arguably
8514-758: The Prevention of Corruption Act 1906 and Criminal Law Act 1977 . Further charges were brought in late 2014 by the SFO in relation to corrupt practices used to obtain energy contracts in Lithuania. Additional charges relating to contracts for the Budapest Metro in Hungary were added in April 2015. In December 2018, three executives of Alstom were found guilty of conspiracy to corrupt following an investigation by
8643-423: The electromagnetic force , one of the four fundamental forces of nature. Experiment has shown charge to be a conserved quantity , that is, the net charge within an electrically isolated system will always remain constant regardless of any changes taking place within that system. Within the system, charge may be transferred between bodies, either by direct contact, or by passing along a conducting material, such as
8772-522: The quantum revolution. Einstein was awarded the Nobel Prize in Physics in 1921 for "his discovery of the law of the photoelectric effect". The photoelectric effect is also employed in photocells such as can be found in solar panels . The first solid-state device was the " cat's-whisker detector " first used in the 1900s in radio receivers. A whisker-like wire is placed lightly in contact with
8901-452: The strong interaction , but unlike that force it operates over all distances. In comparison with the much weaker gravitational force , the electromagnetic force pushing two electrons apart is 10 times that of the gravitational attraction pulling them together. Charge originates from certain types of subatomic particles , the most familiar carriers of which are the electron and proton . Electric charge gives rise to and interacts with
9030-552: The 1,067.2 kilometres (663.1 mi) from Calais to Marseille in 3 hours and 29 minutes. In 1986, Alsthom Belfort received an order from EDF for the largest gas turbine in the world (212 MW). In 1988–89, holding company CGEE Alsthom acquired ACEC Énergie (hydroturbines and electrical equipment for the nuclear industry) and ACEC Automatisme (automation) from the dissolution of Belgian electrical engineering company ACEC . Alsthom acquired 100% of ACEC's transport division, renaming it ACEC Transport . In early 1989, GEC Alsthom
9159-541: The 17th and 18th centuries. The development of the theory of electromagnetism in the 19th century marked significant progress, leading to electricity's industrial and residential application by electrical engineers by the century's end. This rapid expansion in electrical technology at the time was the driving force behind the Second Industrial Revolution , with electricity's versatility driving transformations in both industry and society. Electricity
9288-545: The 1936 discovery of the Baghdad Battery , which resembles a galvanic cell , though it is uncertain whether the artifact was electrical in nature. Electricity would remain little more than an intellectual curiosity for millennia until 1600, when the English scientist William Gilbert wrote De Magnete , in which he made a careful study of electricity and magnetism, distinguishing the lodestone effect from static electricity produced by rubbing amber. He coined
9417-678: The Belfort plant's closure in the short to medium term. In June 2017, Alstom opened the largest train modernisation facility in the UK at Halebank on the outskirts of Liverpool . Initial work involved the repainting of the Class 390 Pendolino s. On 12 November 2024, Alstom announced on their official website that the first of 35 fully automated metropolis trains has been delivered to Taiwan . The four-car stainless-steel train can carry up to 700 passengers, including 108 seated, with speeds up to 100 km/h. On 26 September 2017, Alstom announced
9546-589: The Constructions Électriques de France (1932), shipbuilder Chantiers de l'Atlantique (1976), and parts of ACEC (late-1980s). A merger with parts of the British General Electric Company formed GEC Alsthom in 1989. Throughout the 1990s, the company expanded its holdings in the rail sector, acquiring German rolling stock manufacturer Linke-Hofmann-Busch and Italian rail signaling specialist Sasib Railways. In 1998, GEC Alsthom
9675-656: The Elder and Scribonius Largus , attested to the numbing effect of electric shocks delivered by electric catfish and electric rays , and knew that such shocks could travel along conducting objects. Patients with ailments such as gout or headache were directed to touch electric fish in the hope that the powerful jolt might cure them. Ancient cultures around the Mediterranean knew that certain objects, such as rods of amber , could be rubbed with cat's fur to attract light objects like feathers. Thales of Miletus made
9804-636: The European Commission voiced its concerns surrounding the proposed merger of the two companies, particularly that the combined entity would be too dominant in the European market; alleged impacts from such dominance included potential increases in passenger fares and cargo fees. Furthermore, a series of popular protests concerning the financial reforms of both the French territorial railway infrastructure and SNCF occurred. The proposed merger
9933-419: The French government stated it did not back GE's bid, citing concerns on the future of Alstom's rail division as a smaller separate entity, suggesting that GE transfer its own rail division to Alstom; other concerns were over the civil nuclear field's national independence, and French jobs. On 14 May, France issued a decree ( Décret n° 2014-479 du 14 mai 2014 . ), nicknamed " décret Alstom ", extending to power of
10062-512: The French government's 21% holding in Alstom for €2 billion. Later that year, Bouygues elected to increase its shareholding in the firm to 24%. In 2007, the TGV POS set the world speed record for rail vehicles of 574.8 kilometres per hour (357.2 mph). In March, Alstom acquired Power Systems Manufacturing LLC ( Florida , USA) a manufacturer of gas turbine components from Calpine Corporation for $ 242 million. In June, Alstom acquired
10191-763: The French state agreed terms with Bouygues, buying a 20% stake in Alstom from Bouygues at a 2–5% discount on a minimum value of ≈€35 per share. Initially, the acquisition was expected to be finalised by early 2015. In early 2015, the EU Competition Commission began examining the deal. Both EU and US competition regulators approved the deal by September 2015, subject to the divestiture of Alstom's large and very large gas turbine (GT26 and GT36 models) manufacturing and service business; and its GE7FA gas turbine aftermarket parts subsidiary business, Power Systems Mfg. LLC (PSM), to another company, Ansaldo Energia . The sale of Alstom's energy division to GE
10320-687: The Indian Railways to construct an electric locomotive factory in Madhepura ( Bihar ), receiving an initial order of 800 twin-section 9MW locomotives for use on the Eastern Dedicated Freight Corridor , valued at ₹190 billion (about US$ 2.9 billion). This factory was to be operated under a joint venture with the Ministry of Railways (26%) at a cost of ₹ 13 billion (roughly US$ 200 million). In September 2015, it
10449-566: The SFO into allegations of several Lithuanian politicians and officials being offered bribes in return for securing contracts. In February 2020, the United Nations published a database of all business enterprises involved in certain specified activities related to the Israeli settlements . Alstom has been listed on the database in light of its involvement in activities related to "the provision of services and utilities supporting
10578-626: The Spanish wind turbine manufacturer Ecotècnia, renamed as Alstom Ecotècnia (since 2010 Alstom Wind ). The company also adopted a new graphic chart (logo, corporate identity) using "alstom" as its trading name, reserving "Alstom SA" for legal documents. In 2009, Alstom acquired a 25% stake in the Russian locomotive manufacturer Transmashholding . Six years later, Alstom decided to increase its shareholding in Transmashholding to 33% at
10707-737: The US conglomerate General Electric . In late 2014, Alstom was fined $ 772 million by the DOJ, and admitted guilt under the Foreign Corrupt Practices Act in relation to bribes paid to obtain contracts in various countries. In mid-2014, Alstom Network UK was charged by the UK Serious Fraud Office (SFO) in relation to corruption offences alleged to have been committed when obtaining transportation contracts in India, Poland and Tunisia, covered under sections 1 of
10836-408: The beginning of the field theory of the electric force. Further work was conducted in the 17th and early 18th centuries by Otto von Guericke , Robert Boyle , Stephen Gray and C. F. du Fay . Later in the 18th century, Benjamin Franklin conducted extensive research in electricity, selling his possessions to fund his work. In June 1752 he is reputed to have attached a metal key to the bottom of
10965-419: The building it serves to protect. The concept of electric potential is closely linked to that of the electric field. A small charge placed within an electric field experiences a force, and to have brought that charge to that point against the force requires work . The electric potential at any point is defined as the energy required to bring a unit test charge from an infinite distance slowly to that point. It
11094-602: The capacity of the proposed nuclear power plant at Rajauli, Nawada by half. Karbigahia Thermal Power Station will be developed as the first-ever 'energy park' in Bihar. In September 2012, 43 projects of rural electrification have been sanctioned for Bihar under Rajiv Gandhi Gramin Vidyutikaran Yojana. Electricity Electricity is the set of physical phenomena associated with the presence and motion of matter possessing an electric charge . Electricity
11223-426: The charged particles themselves, hence charge has a tendency to spread itself as evenly as possible over a conducting surface. The magnitude of the electromagnetic force, whether attractive or repulsive, is given by Coulomb's law , which relates the force to the product of the charges and has an inverse-square relation to the distance between them. The electromagnetic force is very strong, second only in strength to
11352-450: The charged parts. Air, for example, tends to arc across small gaps at electric field strengths which exceed 30 kV per centimetre. Over larger gaps, its breakdown strength is weaker, perhaps 1 kV per centimetre. The most visible natural occurrence of this is lightning , caused when charge becomes separated in the clouds by rising columns of air, and raises the electric field in the air to greater than it can withstand. The voltage of
11481-484: The company bought out ABB's share in the former joint venture ABB Alstom Power. In 2000, Alstom sold its diesel engine businesses ( Ruston , Paxman , and Mirrlees Blackstone ) to MAN Group . It also acquired a 51% stake in Italian rail manufacturer Fiat Ferroviaria , a world leader in tilting technology. In April 2003, Alstom sold its industrial turbine business to Siemens for €1.1 billion. By 2003, Alstom
11610-770: The company signed a letter of agreement to purchase the transportation division of the financially struggling Bombardier Inc. The purchase was finalized in January 2021. Alsthom was founded in 1928 from the merger of French heavy engineering subsidiary of the Thomson-Houston Electric Company – the Compagnie Française Thomson Houston, CFTH – and the Société Alsacienne de Constructions Mécaniques . In 1932, Alsthom expanded into transportation by acquiring
11739-411: The current varies in time. Direct current, as produced by example from a battery and required by most electronic devices, is a unidirectional flow from the positive part of a circuit to the negative. If, as is most common, this flow is carried by electrons, they will be travelling in the opposite direction. Alternating current is any current that reverses direction repeatedly; almost always this takes
11868-516: The design and construction of electronic circuits to solve practical problems are part of electronics engineering . Faraday's and Ampère's work showed that a time-varying magnetic field created an electric field, and a time-varying electric field created a magnetic field. Thus, when either field is changing in time, a field of the other is always induced. These variations are an electromagnetic wave . Electromagnetic waves were analysed theoretically by James Clerk Maxwell in 1864. Maxwell developed
11997-711: The development of its tidal energy business, Alstom acquired Tidal Generation Ltd from Rolls-Royce , however this was later sold to GE in 2015 as part of the sale of Alstom's energy business. In November 2013, Alstom announced it planned to raise €1 to €2 billion through sale of some non-core assets, plus the possible sale of a stake in Alstom Transport, and cut 1,300 jobs. In 2014, Alstom sold its steam auxiliary components activities (air preheaters and gas-gas heaters for thermal power, other industrial heat transfer equipment, and grinding mills) to Triton Partners for €730 million. In November 2014 Alstom
12126-473: The diesel locomotive manufacturer Meinfesa to Vossloh , and Alstom Power Rentals to APR LLC. Six years later, Alstom re-acquired the electric power transmission division of Areva. In 2005, the former Metro-Cammell rail vehicle works in Washwood Heath closed. In the same year, Alstom sold its Australian subsidiary, Alstom Transport Australia and New Zealand, to United Group , which became part of
12255-478: The early 19th century had seen rapid progress in electrical science, the late 19th century would see the greatest progress in electrical engineering . Through such people as Alexander Graham Bell , Ottó Bláthy , Thomas Edison , Galileo Ferraris , Oliver Heaviside , Ányos Jedlik , William Thomson, 1st Baron Kelvin , Charles Algernon Parsons , Werner von Siemens , Joseph Swan , Reginald Fessenden , Nikola Tesla and George Westinghouse , electricity turned from
12384-427: The effect was reciprocal: a current exerts a force on a magnet, and a magnetic field exerts a force on a current. The phenomenon was further investigated by Ampère , who discovered that two parallel current-carrying wires exerted a force upon each other: two wires conducting currents in the same direction are attracted to each other, while wires containing currents in opposite directions are forced apart. The interaction
12513-448: The electronic electrometer . The movement of electric charge is known as an electric current , the intensity of which is usually measured in amperes . Current can consist of any moving charged particles; most commonly these are electrons, but any charge in motion constitutes a current. Electric current can flow through some things, electrical conductors , but will not flow through an electrical insulator . By historical convention,
12642-416: The electrons. However, depending on the conditions, an electric current can consist of a flow of charged particles in either direction, or even in both directions at once. The positive-to-negative convention is widely used to simplify this situation. The process by which electric current passes through a material is termed electrical conduction , and its nature varies with that of the charged particles and
12771-428: The elementary charge, and any amount of charge an object may carry is a multiple of the elementary charge. An electron has an equal negative charge, i.e. −1.602 176 634 × 10 coulombs . Charge is possessed not just by matter , but also by antimatter , each antiparticle bearing an equal and opposite charge to its corresponding particle. The presence of charge gives rise to an electrostatic force: charges exert
12900-513: The first 1300 MW generator set for the Paluel Nuclear Power Plant , setting a world record with an output of 1500 MW. In 1978, Alsthom delivered its first TGV to SNCF . The TGV went on to break world rail speed records in 1981 (at 380 kilometres per hour (240 mph)) and in 1990 (at 515.3 kilometres per hour (320.2 mph)). It also set the world endurance record for high-speed train lines in 2001, travelling
13029-495: The form of a sine wave . Alternating current thus pulses back and forth within a conductor without the charge moving any net distance over time. The time-averaged value of an alternating current is zero, but it delivers energy in first one direction, and then the reverse. Alternating current is affected by electrical properties that are not observed under steady state direct current, such as inductance and capacitance . These properties however can become important when circuitry
13158-460: The grid. Commercial operation started in November 2014 after resolving faults. Unit 5 of Stage-2 is also now operational. This is an upcoming power plant with a planned capacity of 1320 MW. Larsen & Toubro Limited holds the contract for the construction, at an estimated cost of ₹7,490 crores. It is scheduled to open in 2023. The current installed capacity of this power plant is 2340 MW and it
13287-547: The latter's UGL Rail division. Alstom would restart its manufacturing operations in Australia by the early 2010s. In 2006, Alstom sold its Marine Division to the Norwegian group Aker Yards , with a commitment to retain 25% of the shares until 2010; it also sold Alstom Power Conversion, which became Converteam , in a leveraged buy-out deal funded by Barclays Private Equity France SAS. In June 2006, Bouygues acquired
13416-504: The maintenance and existence of settlements" and "the use of natural resources, in particular water and land , for business purposes". On 5 July 2021, Norway 's largest pension fund KLP said it would divest from Alstom together with 15 other business entities implicated in the UN report for their links to Israeli settlements in the occupied West Bank. On 24 April 2014, unconfirmed reports claimed that US conglomerate General Electric (GE)
13545-554: The marine market. Alstom's share price had dropped by 90% over two years. European competition commission law required Alstom to sell several of its subsidiaries, including its shipbuilding and electrical transmission assets, when it accepted a €3.2 billion rescue plan involving the French state. In 2004, the French state took a 21% stake in Alstom for €772 million and Alstom received an EU-approved bailout worth in total €2.5 billion. The company sold its electrical transmission and distribution ("grid") activities to Areva ,
13674-400: The material through which they are travelling. Examples of electric currents include metallic conduction, where electrons flow through a conductor such as metal, and electrolysis , where ions (charged atoms ) flow through liquids, or through plasmas such as electrical sparks. While the particles themselves can move quite slowly, sometimes with an average drift velocity only fractions of
13803-428: The principle, now known as Faraday's law of induction , that the potential difference induced in a closed circuit is proportional to the rate of change of magnetic flux through the loop. Exploitation of this discovery enabled him to invent the first electrical generator in 1831, in which he converted the mechanical energy of a rotating copper disc to electrical energy. Faraday's disc was inefficient and of no use as
13932-442: The proposed merger with Siemens. On 6 February 2019, the planned merger between the two companies was vetoed by the European Commission. In response to this ruling, Alstom's Chief Executive Officer Henri Poupart-Lafarge stated that he viewed the decision to block the merger was a result of "ideological prejudices". In mid-February 2020, Alstom announced that it had signed a Memorandum of Agreement to buy Bombardier Transportation ,
14061-630: The sale of GE's rail signalling unit to Alstom. On 20 June, Siemens and MHI modified their bid, with MHI increasing its stake in Alstom's steam, hydro, and grid businesses to 40% in all three (total €3.9 billion) while Siemens increased its offer by €400 million to €4.3 billion. Subsequently, Economy minister Arnaud Montebourg stated he would block both bids, but the French government backed GE's offer and had given GE more specifications on commitments and guarantees; it also intended to buy two-thirds of Bouygues' shareholding (20%). The next day, Alstom's board backed GE's revised bid. On 22 June,
14190-421: The security of the civil nuclear sector, and on job commitments made by Alstom Wind , whilst making its wind activities available to investors. On 30 April, Alstom confirmed that an offer for its power and grid divisions (representing an equity value of €12.35 billion, €11.4 billion enterprise value ) was under review with key interests including the French state. On 30 April, GE confirmed it had made
14319-454: The special property that it is conservative , which means that the path taken by the test charge is irrelevant: all paths between two specified points expend the same energy, and thus a unique value for potential difference may be stated. The volt is so strongly identified as the unit of choice for measurement and description of electric potential difference that the term voltage sees greater everyday usage. For practical purposes, defining
14448-771: The state to veto the takeover of "strategic interests" into areas of energy supply, water, transport, telecoms and public health. Both the French employer organisation MEDEF and the European Commissioner for Internal Market and Services ( Michel Barnier ) responded negatively to the decree. On 16 June, Siemens and Mitsubishi Heavy Industries (MHI) submitted a competing offer for Siemens to acquire Alstom's gas turbine activities for €3.9 billion while MHI would form joint ventures with Alstom, acquiring 40%, 20% and 20% stakes in Alstom's steam and nuclear, electrical grid, and hydroelectric businesses respectively, for €3.1 billion. The proposal included an offer to buy
14577-418: The two forces of nature then known. The force on the compass needle did not direct it to or away from the current-carrying wire, but acted at right angles to it. Ørsted's words were that "the electric conflict acts in a revolving manner." The force also depended on the direction of the current, for if the flow was reversed, then the force did too. Ørsted did not fully understand his discovery, but he observed
14706-417: The vector direction of the field is the line of greatest slope of potential, and where the equipotentials lie closest together. Ørsted's discovery in 1821 that a magnetic field existed around all sides of a wire carrying an electric current indicated that there was a direct relationship between electricity and magnetism. Moreover, the interaction seemed different from gravitational and electrostatic forces,
14835-578: Was announced that Amtrak would award Alstom a contract for $ 2.5 billion for the next generation high-speed train sets for the Northeast Corridor . This would result in the creation of 750 jobs across upstate New York with 400 direct manufacturing jobs at Alstom. The order for 28 Avelia Liberty trainsets was officially confirmed in August 2016 by Amtrak. These trainsets are manufactured at Alstom's plant in Hornell, New York . In March 2016,
14964-609: Was awarded a $ 429.4 million contract to modernise 85 trains for the Mexico City Metro system. Starting in 2009, Alstom's practices were questioned by the United States Department of Justice (DOJ), which violated the 1977 Foreign Corrupt Practices Act . This American law has extraterritorial scope. At the time, Alstom seemed to cooperate with the proceedings. In 2010, the DOJ opened an investigation into Alstom's commercial practices, focusing on
15093-401: Was facing a financial crisis caused by a mix of poor sales and over $ 5 billion of debt liabilities. It reportedly had the potential to force the company's liquidation. These heavy debts were largely due to a $ 4 billion charge over a design flaw in a turbine developed by ABB , acquired by Alstom in 2000, as well as the collapse of customer Renaissance Cruises amid a general downturn in
15222-508: Was finalised on 2 November 2015; the final valuation being €12.4 billion, of which €9.7 billion was transferred to Alstom, the remainder being reinvested in GE/Alstom joint ventures plus other corrections. The acquired businesses were reorganised within GE's existing power generation business ( GE Power & Water ) as GE Power . The remainder of Alstom Group, including GE Signalling (acquired via
15351-543: Was forced to move within the field; they are however an imaginary concept with no physical existence, and the field permeates all the intervening space between the lines. Field lines emanating from stationary charges have several key properties: first, that they originate at positive charges and terminate at negative charges; second, that they must enter any good conductor at right angles, and third, that they may never cross nor close in on themselves. A hollow conducting body carries all its charge on its outer surface. The field
15480-553: Was formed from a 50–50 merger of Alsthom and the Power Systems Division of the British General Electric Company ; for Alsthom this move was intended to aid Alsthom in selling its products outside the French market. In May of that year GEC Alsthom bought British rail vehicle manufacturer Metro-Cammell . During the early-1990s, GEC Alsthom was the principal manufacturer of the British Rail Class 373 ,
15609-481: Was in acquisition talks with Alstom for $ 13 billion with the support of 29%-shareholder Bouygues, causing Alstom's share price to rise 18% in one day. On 27 April, Le Figaro reported that a rival 'cash plus asset swap' offer was issued by Siemens , trading Alstom's power business for part of its rail arm, plus a cash offer as good as GE's and job guarantees. Siemens' bid was reportedly promoted by French economic minister Arnaud Montebourg . Siemens and Alstom had
15738-401: Was inaugurated in January 2018. Unit 9 of 250 MW is under construction and expected to be operational by 2020. There is another ongoing plan for new capacity addition of 500 MW (2x250 MW) to this plant. In March 2013, Central Government assured to provide coal linkage to Barauni Thermal Power Plant. The current installed capacity of this power plant is 1320 MW and in future the plant will have
15867-540: Was increased to 4380 MW. Nabinagar Supercritical Thermal Power Project (STPP) in Nabinagar , Aurangabad , Bihar. BHEL won a ₹ 2,854-crore contract for supply of the steam generator package for three coal-fired thermal units of 660 MW each with supercritical parameters. TRF Ltd, a Tata Group company, has won a ₹ 360.47-crore order from Nabinagar Power Generating Company Pvt. Ltd for designing, engineering, manufacturing, supplying, erecting, testing and commissioning of
15996-675: Was listed on the Paris Stock Exchange and, later that year, it was rebranded Alstom. At the time, the company was manufacturing railway rolling stock, power generation equipment and ships. In 2003, the company required a €3.2 billion bailout from the French government. As a result, Alstom was compelled to dispose of several of its divisions, including shipbuilding and electrical transmission to Areva , in order to comply with European Union rules on state aid . In 2004, Alstom remained in financial difficulties, having incurred massive unexpected costs (€4 billion) arising from
16125-486: Was listed on the Paris Stock Exchange ; both GEC and Alcatel elected to sell off part of their stakes (23.6% each). Around this time, the company was officially renamed Alstom . In 1999, Alstom bought half of ABB 's power systems division, forming a 50-50 joint company known as ABB Alstom Power. Alstom also bought Canada's Télécité, a passenger information and security solutions company, and sold its heavy-duty gas turbine business to General Electric . The next year,
16254-546: Was sold to Ansaldo Energia , and GE agreed to sell Alstom's rail signalling business. The deal was finalised in November 2015; since then, Alstom has been operating solely in the rail sector. In an attempt to grow its rail business, in late-2017, Alstom announced a proposed merger with Siemens Mobility . However, in February 2019, the European Commission prohibited the merger. Subsequently, in February 2020,
16383-530: Was to cease locomotive manufacturing at its Belfort (France) site by 2018 due to low orders; remaining production activity was to be transferred to its facility of Alstom DDF in Reichshoffen , Alsace . However, during October 2016, the French state placed an order of about €650 million for 15 TGV Euroduplex trains; an order for 20 locomotives; plus an order for 30 intercity trains to be built at Reichshoffen. Together, these orders were sufficient to prevent
16512-723: Was unbundled on 2 August 2011. Power Finance Corporation was the main consultant for BSEB's restructuring. BSEB formally started functioning as 5 companies on 1 November 2012, namely: The installed electricity generation capacity in Bihar was 6384.88 MW as of April 2020. There are newer projects under construction which will take total electricity generation capacity in Bihar to more than 12000 MW. On 17 April 2018, Bihar state cabinet, headed by chief minister Nitish Kumar , gave its nod to handing over of Barauni Thermal Power Station , Kanti Thermal Power Station and Nabinagar Super Thermal Power Project to National Thermal Power Corporation . The current installed capacity of this power plant
16641-464: Was viewed by some as a measure to counter the rise of rival Chinese rail business CRRC ; it reportedly received support from many figures within both the French and German governments. The transaction, which was originally due to close by the end of 2018, was met with opposition by French trade union officials who voiced their concerns that such a merger would have the potential for job losses. On 17 July 2018, Alstom shareholders overwhelmingly approved
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