Ampere

The ampere is the unit of electric current (symbol A). It is the intensity of a constant current which, maintained in two rectilinear parallel conductors of infinite length and negligible cross section placed one metre apart, produces a force of 2x10-7 newtons per metre between the two conductors. It corresponds to a flow of electric charge of 1 coulomb per second, or the passage of 6.24 x 1018 electrons per second.