What Are Farads?

By: Dusty Arlia
Published on December 15, 2011
Last Updated on Friday, July 17, 2015 at 11:30 PM
Total Updates: 4

The term farad is usually symbolized as just the capital letter "F". A farad is the SI unit for capacitance. It gets its name from the English physicist Michael Faraday.

A farad is the charge in coulombs (1 amp/sec) which a capacitor will accept for the potential across it to change 1 volt.

For example, a capacitor with a capacitance of 15 nF will increase by 1 volt per second with a 15 nA input current.

1 microfarad (μF) = one millionth (10-6) of a farad
1 nanofarad (nF) = one billionth (10-9) of a farad
1 picofarad (pF) = one trillionth (10-12) of a farad

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