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Ampere The SI unit of Electric current - The ampere is that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed 1 metre apart in vacuum, would produce a force between the conductors equal to 2x10-7 newton per metre of length.
- The official symbol is A.
- Named after the French physicist André-Marie Ampère (1775-1836), one of the pioneers in studying electricity.
- The other electrical units are all defined in terms of the ampere:
- One ampere represents a current flow of one coulomb of charge per second.
- One ampere of current results from a potential distribution of one volt per ohm of resistance.
See also: Abampere, Ammeter, Ampere Andre Marie, Current, Current Density, Kirchoffs Law, Newton, SI Units, Statampere, Voltampere (VA).
  
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