Faraday (unit)

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For the 19th-century scientist, see Michael Faraday. For other uses, see Faraday (disambiguation).

In physics, the faraday (not to be confused with the farad) is an obsolete unit of electrical charge, which has been replaced by the SI unit, the coulomb. One faraday is equal to the charge of one mole of electrons (approximately 96485.3415 coulombs).

The value of a faraday, F, can easily be calculated:

F = N_Ae

where

N_A is Avogadro's number (6.022 ×10²³ mol^-1)

e is the elementary charge (1.602 ×10^-19 C)

Like the farad - another electrical unit, used to measure the capacity of a capacitor - the faraday was named after Michael Faraday.

[edit] See also

• Michael Faraday
• Faraday constant (the corresponding physical constant)
• Faraday Cage (an enclosure designed to block external static electric fields or electromagnetic radiation)
• Faraday Efficiency (in electrolysis)