In physics, the ampere (symbol: A, often informally abbreviated to amp) is the SI base unit used to measure electrical currents. By definition, 1 ampere is that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular crosssection, and placed 1 metre apart in vacuum, would produce between these conductors a force equal to 2x10^{7} newton per meter of length.
The ampere is named after AndréMarie Ampère, one of the main discoverers of electromagnetism.
The unit of electric charge, the coulomb, is defined in terms of the ampere: 1 coulomb is the amount of electric charge carried in a current of 1 ampere flowing for 1 second.
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