The volt (symbol: V)'s the SI derived unit of electromotive force, commonly called "voltage (difference)". It's also the unit for the related but slightly different quantity electric potential difference (also called "electrostatic potential difference"). It's named in honor of the Lombard physicist Alessandro Volta (1745–1827), who invented the voltaic pile, possibly the first chemical battery (see Baghdad Battery). Definition The volt's defined as the value of the voltage (difference)… (More on Volts)