The farad (symbol: F ) is the unit of electrical capacitance , the ability of a body to store an electrical charge, in the International System of Units (SI) , equivalent to 1 coulomb per volt (C/V). It is named after the English physicist Michael Faraday (1791–1867). In SI base units 1 F = 1 kg ⋅ m ⋅ s ⋅ A .
19-602: [REDACTED] Look up PF , Pf. , or pf. in Wiktionary, the free dictionary. PF may refer to: Arts and entertainment [ edit ] Pianoforte , full original name of the piano instrument Phineas Flynn , a fictional character Project Fanboy , a comic book news website Peregrine Falcons Squad, a faction in the Metal Slug series of video games Businesses [ edit ] PF Flyers ,
38-488: A dielectric . The original capacitor was the Leyden jar developed in the 18th century. It is the accumulation of electric charge on the plates that results in capacitance . Modern capacitors are constructed using a range of manufacturing techniques and materials to provide the extraordinarily wide range of capacitance values used in electronics applications from femtofarads to farads, with maximum-voltage ratings ranging from
57-532: A brand of shoes Palestinian Airlines (IATA code PF 1995-2020), a Palestinian airline that operated from Egypt Primera Air (IATA code PF 2009-2018), a Danish airline Pell Frischmann , a multi-disciplinary engineering consultancy Economics and finance [ edit ] Pfennig , a unit of currency formerly used in Germany, symbol ₰ Provident Fund (disambiguation) , name of various pension funds Language [ edit ] Phonetic form ,
76-715: A debate sanctioned by the National Forensic League Pekoe Fannings, a grade of tea leaves See also [ edit ] PF1 (disambiguation) Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with the title PF . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=PF&oldid=1188237030 " Categories : Disambiguation pages Place name disambiguation pages Hidden categories: Short description
95-790: A few volts to several kilovolts. Values of capacitors are usually specified in terms of SI prefixes of farads (F), microfarads ( μF ), nanofarads ( nF ) and picofarads ( pF ). The millifarad ( mF ) is rarely used in practice; a capacitance of 4.7 mF (0.0047 F), for example, is instead written as 4 700 μF . The nanofarad ( nF ) is uncommon in North America. The size of commercially available capacitors ranges from around 0.1 pF to 5 000 F (5 kF) supercapacitors . Parasitic capacitance in high-performance integrated circuits can be measured in femtofarads (1 fF = 0.001 pF = 10 F), while high-performance test equipment can detect changes in capacitance on
114-522: A level of syntactic representation in linguistics Voiceless labiodental affricate (⟨p̪͡f⟩, ⟨p̪͜f⟩, or ⟨p̪f⟩), a type of consonant sound Pf (digraph) , a German digraph Organizations [ edit ] Pheasants Forever , a non-profit habitat conservation organization Federal Police ( Polícia Federal ), in Brazil Patients' Front , a late 1960s to early 1970s West German pro-illness movement South Vietnamese Popular Force ,
133-705: A local defense militia formed by South Vietnam during the Vietnam War Patriotic Front (disambiguation) , name of a political party in several countries Places [ edit ] Paracel Islands , FIPS PUB 10-4 territory code French Polynesia (Polynésie française), by ISO 3166 code .pf , internet country code for French Polynesia Pforzheim and Enzkreis district, Germany (vehicle plate code PF) Science and technology [ edit ] Computing [ edit ] .pf , internet country code for French Polynesia PF (firewall) , OpenBSD's stateful packet filter PF keys ,
152-493: A type of foul in several sports Power forward (disambiguation) , a type of position in several sports Other uses [ edit ] A US Navy hull classification symbol: Patrol frigate (PF) Pilot flying , in commercial aviation, a designation for the pilot in control of an aircraft Pour féliciter, text on New Year card Procurator fiscal , the public prosecutor in Scotland Public forum debate ,
171-457: A type of function keys on old keyboards Page fault , a type of exception (error) in computer programming Page file , a file used as an extension for computer memory Physics [ edit ] Power factor , or cos phi, of an AC electric power system Purple fringing , a type of chromatic aberration in photography Phenol formaldehyde resin , the earliest synthetic polymer Picofarad (pF) or petafarad (PF), multiples of farad ,
190-593: Is a square version of ファラッド ( faraddo , the Japanese word for "farad") intended for Japanese vertical text . It is included in Unicode for compatibility with earlier character sets . The reciprocal of capacitance is called electrical elastance , the (non-standard, non-SI) unit of which is the daraf . The abfarad (abbreviated abF) is an obsolete CGS unit of capacitance , which corresponds to 10 farads (1 gigafarad, GF). The statfarad (abbreviated statF)
209-451: Is different from Wikidata All article disambiguation pages All disambiguation pages PF">PF The requested page title contains unsupported characters : ">". Return to Main Page . Farad The capacitance of a capacitor is one farad when one coulomb of charge changes the potential between the plates by one volt . Equally, one farad can be described as
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#1732772897081228-470: The Earth's ionosphere with respect to the ground is calculated to be about 1 F. The picofarad (pF) is sometimes colloquially pronounced as "puff" or "pic", as in "a ten-puff capacitor". Similarly, "mic" (pronounced "mike") is sometimes used informally to signify microfarads. Nonstandard abbreviations were and are often used. Farad has been abbreviated "f", "fd", and "Fd". For the prefix "micro-", when
247-516: The Greek small letter "μ" or the legacy micro sign "μ" is not available (as on typewriters) or inconvenient to enter, it is often substituted with the similar-appearing "u" or "U", with little risk of confusion. It was also substituted with the similar-sounding "M" or "m", which can be confusing because M officially stands for 1,000,000, and m preferably stands for 1/1000. In texts prior to 1960, and on capacitor packages until more recently, "microfarad(s)"
266-779: The SI unit of electric capacitance Photon Factory , a synchrotron located at KEK in Tsukuba, Japan In other sciences and mathematics [ edit ] pf(A), the Pfaffian of a matrix A Phenylphosphine , an organophosphorus compound Plasmodium falciparum , a species of Plasmodium that causes malaria in humans Polar front , in meteorology Position fix , a position derived from measuring external reference points Psychometric function , an inferential psychometric model Horowitz index (PF), blood oxygenation Sports [ edit ] Personal foul (disambiguation) ,
285-460: The capacitance which stores a one-coulomb charge across a potential difference of one volt. The relationship between capacitance, charge, and potential difference is linear. For example, if the potential difference across a capacitor is halved, the quantity of charge stored by that capacitor will also be halved. For most applications, the farad is an impractically large unit of capacitance. Most electrical and electronic applications are covered by
304-2072: The following SI prefixes : A farad is a derived unit based on four of the seven base units of the International System of Units : kilogram (kg), metre (m), second (s), and ampere (A). Expressed in combinations of SI units, the farad is: F = s 4 ⋅ A 2 m 2 ⋅ kg = s 2 ⋅ C 2 m 2 ⋅ kg = C V = A ⋅ s V = W ⋅ s V 2 = J V 2 = N ⋅ m V 2 = C 2 J = C 2 N ⋅ m = s Ω = 1 Ω ⋅ Hz = S Hz = s 2 H , {\displaystyle {\text{F}}={\dfrac {{\text{s}}^{4}{\cdot }{\text{A}}^{2}}{{\text{m}}^{2}{\cdot }{\text{kg}}}}={\dfrac {{\text{s}}^{2}{\cdot }{\text{C}}^{2}}{{\text{m}}^{2}{\cdot }{\text{kg}}}}={\dfrac {\text{C}}{\text{V}}}={\dfrac {{\text{A}}{\cdot }{\text{s}}}{\text{V}}}={\dfrac {{\text{W}}{\cdot }{\text{s}}}{{\text{V}}^{2}}}={\dfrac {\text{J}}{{\text{V}}^{2}}}={\dfrac {{\text{N}}{\cdot }{\text{m}}}{{\text{V}}^{2}}}={\dfrac {{\text{C}}^{2}}{\text{J}}}={\dfrac {{\text{C}}^{2}}{{\text{N}}{\cdot }{\text{m}}}}={\dfrac {\text{s}}{\Omega }}={\dfrac {1}{\Omega {\cdot }{\text{Hz}}}}={\dfrac {\text{S}}{\text{Hz}}}={\dfrac {{\text{s}}^{2}}{\text{H}}},} where F = farad , s = second , C = coulomb , V = volt , W = watt , J = joule , N = newton , Ω = ohm , Hz = Hertz , S = siemens , H = henry , A = ampere . The term "farad"
323-432: The order of tens of attofarads (1 aF = 10 F). A value of 0.1 pF is about the smallest available in capacitors for general use in electronic design, since smaller ones would be dominated by the parasitic capacitances of other components, wiring or printed circuit boards . Capacitance values of 1 pF or lower can be achieved by twisting two short lengths of insulated wire together. The capacitance of
342-601: Was abbreviated "mf" or "MFD" rather than the modern "μF". A 1940 Radio Shack catalog listed every capacitor's rating in "Mfd.", from 0.000005 Mfd. (5 pF) to 50 Mfd. (50 μF). "Micromicrofarad" or "micro-microfarad" is an obsolete unit found in some older texts and labels, contains a nonstandard metric double prefix . It is exactly equivalent to a picofarad (pF). It is abbreviated μμF, uuF, or (confusingly) "mmf", "MMF", or "MMFD". Summary of obsolete or deprecated capacitance units or abbreviations: (upper/lower case variations are not shown) U+3332 ㌲ SQUARE HUARADDO
361-616: Was originally coined by Latimer Clark and Charles Bright in 1861, in honor of Michael Faraday , for a unit of quantity of charge, and by 1873, the farad had become a unit of capacitance. In 1881, at the International Congress of Electricians in Paris, the name farad was officially used for the unit of electrical capacitance. A capacitor generally consists of two conducting surfaces, frequently referred to as plates, separated by an insulating layer usually referred to as
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