Coulomb

The coulomb (symbol: C) is the unit of electric charge in the International System of Units (SI). It is defined as the amount of charge that is transported by a constant current of one ampere (A) in one second (s).

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1 A

1 C

in a time of

1 s

; a constant current of

2 A

for

3 s

6 C

. The prefix in

1 nC = 1 0^{- 9} C

explains the much smaller charge scale used in the worked Coulomb's law example. ^[ref]