Definitions

# Electrical charge

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In physics, the faraday (not to be confused with the farad) is an obsolete unit of electrical charge, which has been replaced by the SI unit, the coulomb.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:

$F = N_A e$

where

$N_A$ is Avogadro's number (6.022 mol-1)
$e$ is the elementary charge (1.602 C)

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