The basic unit of electric current intensity, equal, in the meter-kilogram-second system, to a rate of flow of charge in a conductor or conducting medium of one coulomb per second and, in the SI system, to a constant current that, if maintained in two straight parallel conductors of infinite length and negligible circular cross section placed one meter apart in a vacuum, would produce between these conductors a force equal to 2 x 10-7 newtons per meter of length.
Abbreviation: A, amp
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ohm