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ampere (A)
Abbreviated to amp, the standard unit of electric current. One ampere (A) is defined as the constant current that, if maintained in two straight parallel conductors of infinite length and negligible circular cross-section, and placed 1 meter apart in vacuum, would produce between these conductors a force of 2 × 10-7 newton per meter. It is named after the French physicist André Marie Ampère (1775-1836).
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