The unit of electrical
potential difference (also called electromotive force) is the volt. It is named after Italian physicist Count
Alessandro Giuseppe Antonio Anastasio Volta (February 18, 1745 - March 5, 1827), who developed the first electric
battery in 1800.
One volt of direct current applied across one ohm of resistance causes one ampere of current to flow, and one
watt of power to be dissipated across the resistor.
Standard unit = Volt (V)
W = watt, J = joule, A = ampere,
N = newton, s = second, m = meter,
kilogram, C = coulomb
V = W/A = W∙s/A∙s = J/C = N∙m/A∙s = kg∙m2
|1 abV =
||3.336 * 10-11
|1 V =
||3.336 * 10-3
|1 statV =
||2.998 * 1010
Note: The prefix "ab" is used to indicate an electromagnetic unit in the
The prefix "stat" is used to indicate an electrical unit in the
electrostatic centimeter-gram-second system of units.