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WordReference Random House Learner's Dictionary of American English © 2025am•pere /ˈæmpɪr, æmˈpɪr/USA pronunciation
n. [countable]
- Electricitya unit of electrical current.Abbr.: A, amp.
WordReference Random House Unabridged Dictionary of American English © 2025am•pere
(am′pēr, am pēr′),USA pronunciation n. [Elect.]
- Electricitythe base SI unit of electrical current, equivalent to one coulomb per second, formally defined to be the constant current which if maintained in two straight parallel conductors of infinite length, of negligible circular cross section, and placed one meter apart in vacuum, would produce between these conductors a force equal to 2 × 10-7 newton per meter of length. Abbr.: A, amp.
Also, am′père.
- named after A. M. Ampère 1881
- French physicist.
Am•per•i•an
(am pēr′ē ən, -per′-),USA pronunciation adj.
Collins Concise English Dictionary © HarperCollins Publishers::
ampere / ˈæmpɛə/ - the basic SI unit of electric current; the constant current that, when maintained in two parallel conductors of infinite length and negligible cross section placed 1 metre apart in free space, produces a force of 2 × 10–7 newton per metre between them. 1 ampere is equivalent to 1 coulomb per second
- a former unit of electric current (international ampere); the current that, when passed through a solution of silver nitrate, deposits silver at the rate of 0.001118 gram per second. 1 international ampere equals 0.999835 ampere
Abbreviation: amp
Symbol: A Etymology: 19th Century: named after André Marie Ampère
'ampere' also found in these entries (note: many are not synonyms or translations):
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