Cambridge Encyclopedia » Cambridge Encyclopedia Vol. 5

ampere - Definition, Explanation, Proposed future definition

current

The base SI unit of current; symbol A, often called amp, named after André Ampère; defined as the constant current which, if maintained in two straight parallel conductors of infinite length, of negligible cross-section, and placed 1 metre apart in vacuum, would produce a force equal to 2 × 10?7 N/m.

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