The derived unit of electrical capacitance in the SI system of units. One farad (F) is the capacitance of an electric capacitor between the two plates of which there appears a difference of electric potential of one volt when it is charged by a quantity of electricity equal to one coulomb (F = C/V). The unit is named after the British scientist Michael Faraday.
One farad is an exceptionally large capacitance: the entire Earth, considered as a spherical conductor of radius 4,000 miles, has a calculated capacitance of only 0.0007 farad. Capacitances that are actually encountered are expressed in microfarads or picofarads.
Related categories• ELECTRICITY AND MAGNETISM
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