The basic unit of electric current in the meter-kilogram-second system; equivalent to one coulomb per second.

One ampere is the current that, if held constant in two parallel conductors of infinite length at a distance of one meter apart in a vacuum, will produce a force of 2 X 10 newton per meter of length.

André Marie Ampère (1775-1836) was a French physicist and mathematician, a key figure in the development of the fields of electricity and magnetism.

Ampère produced a definition of the unit of measurement of current flow, now known as the ampere.

1. A unit for expressing the integral of apparent power over time, equal to the product of 1 volt-ampere and 1 hour, or to 3600 joules.
2. A unit for the integral of apparent power over time, equal to the product of one volt-ampere and one hour.

1. A standard unit of apparent power, equal to the product of one volt and one thousandth of an ampere (milliampere).
2. An electric measurement unit, equal to the product of one volt and one ampere, equivalent to one watt for direct current systems and a unit of apparent power for alternating current systems.
3. A unit of electric measurement equal to the product of a volt and an ampere that for direct current constitutes a measure of power equivalent to a watt.

The unit of reactive power which is equal to the reactive power in a circuit carrying a sinusoidal current when the product of the root-mean-square value of the voltage, expressed in volts, by the root-mean-square value of the current, expressed in amperes.