Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The basic unit of electric current, equal to one coulomb per second and equivalent to the current, flowing in two straight parallel wires of negligible cross section separated by a distance of one meter, that produces a force between the wires of 2.0 × 10−7 newtons per meter of length. The value of an ampere in the International System differs very slightly from that in the meter-kilogram-second-ampere system of units.

from The Century Dictionary.

  • noun The unit employed in measuring the strength of an electrical current. It is the current which flows through a conductor whose resistance is one ohm, and between the two ends of which the unit difference of potentials, one volt, is maintained.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A unit of electrical current, the standard base unit in the International System of Units. Abbreviation: amp, Symbol: A

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a former unit of electric current (slightly smaller than the SI ampere)
  • noun the basic unit of electric current adopted under the Systeme International d'Unites

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[After André Marie Ampère.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

Named after the French physicist André-Marie Ampère.

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