# ampere

## Definitions

### General Science

- noun in the SI system, the basic unit of electric current equal to a current between two parallel conductors in a vacuum that produces a force equal to 2x10
^{–7}newtons per metre

### Aviation

- noun a
__unit__of electric current equal to one volt flowing through an impedance of one ohm

### Cars & Driving

- noun the basic unit for measuring electric current, usually abbreviated to amp

### Computing

- noun the base SI
__unit__of electrical current, defined as the current flowing through an impedance of one ohm which has a voltage of one__volt__across it.

### Construction

- The electromotive force required to move one volt of electricity across one ohm of resistance. A measure of electrical current.

## Origin & History of “ampere”

__this__international term for a unit of electrical current derives from the name of André-Marie Ampère (1775–1836), the French physicist and mathematician. It was officially adopted by the Congrès Électrique in Paris in 1881. Ampère himself is

__best__remembered for

__first__making the distinction

__between__electrical current and voltage, and for explaining magnetism in terms of electrical currents. The term

*ammeter*‘current-measuring device’ (19

^{th}c.) was based on

*ampere*.