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The farad is the SI unit of capacitance (named after Michael Faraday). A capacitor has a value of one farad when one coulomb of charge causes a potential difference of one volt across it.

Its dimensions in SI units are CV-1 = m-2kg-1s4A2.

Since the farad is a very large unit, values of capacitors are usually expressed in microfarads (μF), nanofarads (nF), or picofarads (pF).

The daraf is the unit of elastance, which is the reciprocal of capacitance.

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