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{{About|the unit of measurement|the former settlement in California|Farad, California}}
{{Distinguish|faraday (unit)}}
{{lead too short|date=December 2012}}
 
{{Infobox Unit
| bgcolour =
| name = Farad
| image = [[File:OneFarad5.5Velectrolyticcapacitor.jpg|300px]]
| caption = A comparatively small 1 farad capacitor, for low voltages and current transfers.
| standard = [[SI derived unit]]
| quantity = [[Capacitance]]
| symbol = F
| dimension = M<sup>&minus;1</sup>&sdot;L<sup>&minus;2</sup>&sdot;T<sup>4</sup>&sdot;I<sup>2</sup>
| namedafter = [[Michael Faraday]]
| extralabel = In [[SI base unit]]s:
| extradata = 1 F = 1 [[second|s]]{{Smallsup|4}}·[[ampere|A]]{{Smallsup|2}}·[[meter|m]]{{Smallsup|−2}}·[[kilogram|kg]]{{Smallsup|−1}}
}}
 
[[File:Capacitors Various.jpg|thumb|right|Examples of various types of capacitors.]]
 
The '''farad''' (symbol: F) is the [[SI derived unit]] of electrical [[capacitance]]. It is named after the English physicist [[Michael Faraday]].
 
== Definition ==
One farad is the value of [[capacitance]] that produces a potential difference of one [[volt]] when it has been [[electric charge|charged]] by one [[coulomb]]. A coulomb is equal to the amount of charge (electrons) produced by a current of one [[ampere]] flowing for one [[second]]. For example, the voltage across the two terminals of a 47&nbsp;nF [[capacitor]] will increase linearly by 1&nbsp;V when a current of 47&nbsp;nA flows through it for 1&nbsp;s.
 
For most applications, the farad is an impractically large unit of capacitance, although capacitors measured in farads are now used, especially for backing up memory. The most commonly used [[SI prefix]]es for electrical and electronic applications are:
 
* 1&nbsp;millifarad (mF) = one thousandth ({{10^|−3}}) of a farad or {{gaps|1|000}}&nbsp;μF
* 1&nbsp;microfarad (μF, or MFD in industrial use) = one millionth ({{10^|−6}}) of a farad, or {{gaps|1|000|000}}&nbsp;pF, or {{gaps|1|000}}&nbsp;nF
* 1&nbsp;nanofarad (nF) = one billionth ({{10^|−9}}) of a farad, or {{gaps|1|000}}&nbsp;pF
* 1&nbsp;picofarad (pF) = one trillionth ({{10^|−12}}) of a farad
 
=== Equalities ===
A farad has the base SI representation of:
[[Second|s]]{{sup|4}} × [[ampere|A]]{{sup|2}} × [[meter|m]]{{sup|−2}} × [[kilogram|kg]]{{sup|−1}}
 
It can further be expressed as:
 
:<math>\mbox{F}
= \,\mathrm{\frac{A \cdot s}{V}
= \dfrac{\mbox{J}}{\mbox{V}^2}
= \dfrac{\mbox{W} \cdot \mbox{s}}{\mbox{V}^2}
= \dfrac{\mbox{C}}{\mbox{V}}
= \dfrac{\mbox{C}^2}{\mbox{J}}
= \dfrac{\mbox{C}^2}{\mbox{N} \cdot \mbox{m}}
= \dfrac{\mbox{s}^2 \cdot \mbox{C}^2}{\mbox{m}^{2} \cdot \mbox{kg}}
= \dfrac{\mbox{s}^4 \cdot \mbox{A}^2}{\mbox{m}^{2} \cdot \mbox{kg}}
= \dfrac{\mbox{s}}{\Omega}}
</math>
 
where A=[[ampere]], V=[[volt]], C=[[coulomb]], J=[[joule]], m=[[metre]], N=[[newton (unit)|newton]], s=[[second]], W=[[watt]], kg=[[kilogram]], Ω=[[ohm]].
 
== History ==
The term "farad" was coined by [[Josiah Latimer Clark]] in the year of 1861, in honor of [[Michael Faraday]], but it was for a unit of quantity of charge.
 
== Explanation ==
Values of capacitors are usually [[SI prefix#List of SI prefixes|specified in ranges]] of '''farads''' (F), '''millifarads''' (mF), '''microfarads''' (μF, or MFD in industrial use<ref>In texts prior to 1960, '''mf''' rather than the modern '''µF''' frequently represented microfarads. Similarly, '''mmf''' represented picofarads.</ref>), '''nanofarads''' (nF) or '''picofarads''' (pF).<ref name="Braga">{{cite book |title=Robotics, Mechatronics, and Artificial Intelligence |last=Braga |first=Newton C. |year=2002 |accessdate=2008-09-17 |publisher=Newnes |page=21 |url=http://books.google.com/books?id=yqb-f-HKem0C&pg=PA21&q=microfarad+common+measurement |isbn=0-7506-7389-3 |quote=Common measurement units are the microfarad (μF), representing 0.000,001 F; the nanofarad (nF), representing 0.000,000,001 F; and the picofarad (pF), representing 0.000,000,000,001 F.}}</ref>
 
The size of commercially available capacitors ranges from around 100 fF (femtofarads, {{10^|−15}} F) to 5 kF (kilofarads, {{10^|3}} F) [[supercapacitor]]s. Designers of high performance integrated circuits are concerned about [[parasitic capacitance]] measured in femtofarads, while makers of high performance test equipment are able to detect changes in capacitance on the order of tens of attofarads ({{10^|−18}}).<ref>{{cite book |title=Analog MOS Integrated Circuits for Signal Processing |last=Gregorian |first=Roubik |year=1976 |publisher=John Wiley & Sons |page=78}}</ref>
 
A ''picofarad'' is sometimes referred to as a ''"puff"'' or ''"pic"'', as in "a ten puff capacitor".<ref>{{cite web |title=Puff |url=http://scienceworld.wolfram.com/physics/Puff.html |publisher=Wolfram Research |accessdate=2009-06-09}}</ref> If [[Mu (letter)|the Greek letter μ]] is not available, the notation ''uF'' is often used as a substitute for ''μF'' in electronics literature. A ''micro-microfarad'' (μμF, and confusingly often mmf or MMF), an obsolete unit sometimes found in older texts, is the equivalent of a ''picofarad''. The ''millifarad'' is less used in practice, so that a capacitance of 4.7{{e|−3}} F, for example, is sometimes written as {{gaps|4|700}} µF; industrial parts at times use the abbreviation MFD instead of µF.<ref>{{cite web |title=Microfarad |url=http://www.thefreedictionary.com/Microfarad |publisher=The Free Dictionary |accessdate=2012-08-13}}</ref> North American usage also avoids ''nanofarads'': a capacitance of 1{{e|−9}} F will frequently be indicated as {{gaps|1|000}} pF; and a capacitance of 1{{e|−7}} F as 0.1 μF.
 
The reciprocal of capacitance is called [[electrical elastance]], the (non-standard, non-SI) unit of which is the [[daraf]].<ref>{{cite web |title=Daraf |url=http://www.websters-dictionary-online.com/definitions/daraf |publisher=Webster's Online Dictionary |accessdate=2009-06-19}}</ref>
 
A capacitor consists of two conducting surfaces, frequently referred to as plates, separated by an insulating layer usually referred to as 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 a few [[volt]]s to several kilovolts.
 
One picofarad is about the smallest value of capacitor available for general use in electronic design, since smaller capacitors would be dominated by the parasitic capacitances ([[stray capacitance]]) of other components, wiring or [[printed circuit board]]s. When capacitance values of 1 pF or lower are required, engineers sometimes create their own capacitors by twisting two short lengths of insulated wire together.<ref>{{cite web |title=What's All This Femtoampere Stuff, Anyhow? |url=http://electronicdesign.com/test-amp-measurement/whats-all-femtoampere-stuff-anyhow |last=Pease |first=Bob |authorlink=Bob Pease |publisher=Electronic Design |date=2 September 1993 |accessdate=2013-03-09}}</ref><ref>{{cite web |title=What's All This Best Stuff, Anyhow? |url=http://electronicdesign.com/analog/whats-all-best-stuff-anyhow |last=Pease |first=Bob |publisher=Electronic Design |date=1 December 2006 |accessdate=2013-03-09}}</ref>
 
The capacitance of the Earth's [[ionosphere]] with respect to the ground is calculated to be about 1 F.<ref>{{cite web |url=http://konfluence.org/efield.pdf |title=Electrical Properties of the Fair-Weather Atmosphere and the Possibility of Observable Discharge on Moving Objects |last=Williams |first=L. L. |date=January 1999 |accessdate=2012-08-13}}</ref>
 
==CGS units==
The '''abfarad''' (abbreviated abF) is an obsolete [[CGS]] unit of capacitance equal to {{10^|9}} farads (1 gigafarad, GF). This very large unit is used in medical terminology only.
 
The '''statfarad''' (abbreviated statF) is a different and also rarely used CGS unit of capacitance that corresponds to approximately 1.1126 picofarads.  It is equivalent to the capacitance of a capacitor with a charge of 1 statcoulomb across a potential difference of 1 statvolt.
 
== See also ==
*[[Supercapacitor]]
 
== Notes ==
{{Reflist|33em}}
 
== External links ==
* [http://www.translatorscafe.com/cafe/units-converter/electrostatic-capacitance/c/ Farad unit conversion tool]
 
{{SI units}}
 
[[Category:SI derived units]]
[[Category:Units of electrical capacitance]]
[[Category:Michael Faraday]]

Revision as of 09:42, 3 February 2014

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Template:Infobox Unit

Examples of various types of capacitors.

The farad (symbol: F) is the SI derived unit of electrical capacitance. It is named after the English physicist Michael Faraday.

Definition

One farad is the value of capacitance that produces a potential difference of one volt when it has been charged by one coulomb. A coulomb is equal to the amount of charge (electrons) produced by a current of one ampere flowing for one second. For example, the voltage across the two terminals of a 47 nF capacitor will increase linearly by 1 V when a current of 47 nA flows through it for 1 s.

For most applications, the farad is an impractically large unit of capacitance, although capacitors measured in farads are now used, especially for backing up memory. The most commonly used SI prefixes for electrical and electronic applications are:

Equalities

A farad has the base SI representation of: sShowcasing you the finest up and coming new condo launches in Singapore where you can search and discover the perfect house. Now we have new condo that may even satisfy the discerning few, it doesn't matter what's your necessities or your lifestyle needs. You'll certain to search out the dream apartment right here.

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MAS agrees that it is crucial for banks to make use of valuations that are reflective of actual property values. We anticipate banks to adopt sound valuation processes. These embody participating unbiased valuers from corporations that aren't involved within the property transaction as gross sales agents or consultants, allocating valuation assignments randomly or on a rotational basis, obtaining a number of valuations for each property, and checking that the valuations are affordable.

A developer who undertakes a challenge of more than 4 units should comply with stringent government circumstances before he can begin to sell models in his venture. On high of that, all monies for a project together with loans and funds by buyers should be deposited right into a project account at a bank or monetary institution. The developer can solely withdraw cash from the venture account to pay for prices associated to the project. What's the Undertaking Account? What does it do? LA FIESTA can be a competition themed condominium growth comprising of 808 units of 1 to five-bed room items including three- and four-bed room twin key models. There might be 13 blocks of 15 storey with 2 basement car parks. Continuereading "Jewel @ Buangkok Upcoming launch, three minutes from Buangkok MRT."

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While every effort has been made to make sure that all information displayed herein are accurate and complete, the data are indicative relatively than definitive. Thus its accuracy, whether express or implicit, isn't assured and to the fullest extent permitted by relevant laws. The Writer/Developer/Huttons Real Property Group does not accept accountability for any errors, inaccuracies, omissions or for any loss which could end result directly or indirectly from reliance on the content material herein. The Writer also reserves the best to correct or update the content material at any time without prior notification. Users are advised to contact the advertiser for any clarifications or latest updates.

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MAS agrees that it is crucial for banks to make use of valuations that are reflective of actual property values. We anticipate banks to adopt sound valuation processes. These embody participating unbiased valuers from corporations that aren't involved within the property transaction as gross sales agents or consultants, allocating valuation assignments randomly or on a rotational basis, obtaining a number of valuations for each property, and checking that the valuations are affordable.

A developer who undertakes a challenge of more than 4 units should comply with stringent government circumstances before he can begin to sell models in his venture. On high of that, all monies for a project together with loans and funds by buyers should be deposited right into a project account at a bank or monetary institution. The developer can solely withdraw cash from the venture account to pay for prices associated to the project. What's the Undertaking Account? What does it do? LA FIESTA can be a competition themed condominium growth comprising of 808 units of 1 to five-bed room items including three- and four-bed room twin key models. There might be 13 blocks of 15 storey with 2 basement car parks. Continuereading "Jewel @ Buangkok Upcoming launch, three minutes from Buangkok MRT."

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While every effort has been made to make sure that all information displayed herein are accurate and complete, the data are indicative relatively than definitive. Thus its accuracy, whether express or implicit, isn't assured and to the fullest extent permitted by relevant laws. The Writer/Developer/Huttons Real Property Group does not accept accountability for any errors, inaccuracies, omissions or for any loss which could end result directly or indirectly from reliance on the content material herein. The Writer also reserves the best to correct or update the content material at any time without prior notification. Users are advised to contact the advertiser for any clarifications or latest updates.

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MAS agrees that it is crucial for banks to make use of valuations that are reflective of actual property values. We anticipate banks to adopt sound valuation processes. These embody participating unbiased valuers from corporations that aren't involved within the property transaction as gross sales agents or consultants, allocating valuation assignments randomly or on a rotational basis, obtaining a number of valuations for each property, and checking that the valuations are affordable.

A developer who undertakes a challenge of more than 4 units should comply with stringent government circumstances before he can begin to sell models in his venture. On high of that, all monies for a project together with loans and funds by buyers should be deposited right into a project account at a bank or monetary institution. The developer can solely withdraw cash from the venture account to pay for prices associated to the project. What's the Undertaking Account? What does it do? LA FIESTA can be a competition themed condominium growth comprising of 808 units of 1 to five-bed room items including three- and four-bed room twin key models. There might be 13 blocks of 15 storey with 2 basement car parks. Continuereading "Jewel @ Buangkok Upcoming launch, three minutes from Buangkok MRT."

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While every effort has been made to make sure that all information displayed herein are accurate and complete, the data are indicative relatively than definitive. Thus its accuracy, whether express or implicit, isn't assured and to the fullest extent permitted by relevant laws. The Writer/Developer/Huttons Real Property Group does not accept accountability for any errors, inaccuracies, omissions or for any loss which could end result directly or indirectly from reliance on the content material herein. The Writer also reserves the best to correct or update the content material at any time without prior notification. Users are advised to contact the advertiser for any clarifications or latest updates.

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Freedman would probably level out that my marinara sauce is not notably healthy (wine and bacon, after all, are simply foodie types of salt, sugar and fats) and, serving for serving, must be dearer than $2-per-jar Ragu. He may argue that top property developers in singapore a couple of years, Ragu or General Foods or Kraft will supply a pasta sauce that is nutritionally identical to mine, and that I might be a snob not to buy it. And he is perhaps right. But for now, neither of us can escape the reality that food, like the whole lot else we buy, is designed to be cheap to make, to last forever and to style better than the following product down the shelf. And in addition like all the pieces else, after you purchase it, you're on your own. World Entrepreneurship and Improvement Index (GEDI).

It can further be expressed as:

where A=ampere, V=volt, C=coulomb, J=joule, m=metre, N=newton, s=second, W=watt, kg=kilogram, Ω=ohm.

History

The term "farad" was coined by Josiah Latimer Clark in the year of 1861, in honor of Michael Faraday, but it was for a unit of quantity of charge.

Explanation

Values of capacitors are usually specified in ranges of farads (F), millifarads (mF), microfarads (μF, or MFD in industrial use[1]), nanofarads (nF) or picofarads (pF).[2]

The size of commercially available capacitors ranges from around 100 fF (femtofarads, Template:10^ F) to 5 kF (kilofarads, Template:10^ F) supercapacitors. Designers of high performance integrated circuits are concerned about parasitic capacitance measured in femtofarads, while makers of high performance test equipment are able to detect changes in capacitance on the order of tens of attofarads (Template:10^).[3]

A picofarad is sometimes referred to as a "puff" or "pic", as in "a ten puff capacitor".[4] If the Greek letter μ is not available, the notation uF is often used as a substitute for μF in electronics literature. A micro-microfarad (μμF, and confusingly often mmf or MMF), an obsolete unit sometimes found in older texts, is the equivalent of a picofarad. The millifarad is less used in practice, so that a capacitance of 4.7Template:E F, for example, is sometimes written as Template:Gaps µF; industrial parts at times use the abbreviation MFD instead of µF.[5] North American usage also avoids nanofarads: a capacitance of 1Template:E F will frequently be indicated as Template:Gaps pF; and a capacitance of 1Template:E F as 0.1 μF.

The reciprocal of capacitance is called electrical elastance, the (non-standard, non-SI) unit of which is the daraf.[6]

A capacitor consists of two conducting surfaces, frequently referred to as plates, separated by an insulating layer usually referred to as 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 a few volts to several kilovolts.

One picofarad is about the smallest value of capacitor available for general use in electronic design, since smaller capacitors would be dominated by the parasitic capacitances (stray capacitance) of other components, wiring or printed circuit boards. When capacitance values of 1 pF or lower are required, engineers sometimes create their own capacitors by twisting two short lengths of insulated wire together.[7][8]

The capacitance of the Earth's ionosphere with respect to the ground is calculated to be about 1 F.[9]

CGS units

The abfarad (abbreviated abF) is an obsolete CGS unit of capacitance equal to Template:10^ farads (1 gigafarad, GF). This very large unit is used in medical terminology only.

The statfarad (abbreviated statF) is a different and also rarely used CGS unit of capacitance that corresponds to approximately 1.1126 picofarads. It is equivalent to the capacitance of a capacitor with a charge of 1 statcoulomb across a potential difference of 1 statvolt.

See also

Notes

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External links

Template:SI units

  1. In texts prior to 1960, mf rather than the modern µF frequently represented microfarads. Similarly, mmf represented picofarads.
  2. 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.

    My blog: http://www.primaboinca.com/view_profile.php?userid=5889534
  3. 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.

    My blog: http://www.primaboinca.com/view_profile.php?userid=5889534
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