Defined as the quantity of charge which passes any section of a conductor in one second when a current of one ampere is flowing.
1 C = 1 As
|3600 Coulomb||=||1 Ampere-hour [Ah]||1 Coulomb||=||6.24x1018 protons|
|1 Coulomb||=||-6.24x1018 electrons|
Electrons and protons each have exactly the same, although opposite, charges equal to 1.602x10-19C.