ampere
or am·père
[ ampeer, ampeer ]
/ ˈæm pɪər, æmˈpɪər /

noun Electricity.
the basic unit of electrical current in the International System of Units(SI), 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. Abbreviation: A, amp.
Nearby words
amp., ampas, ampelopsis, ampelos, amperage, ampere, amperehour, ampereturn, amperometric, amperometric titration, ampersand
Origin of ampere
First recorded in 1881; named after A. M. Ampère
Definition for ampere (2 of 2)
Ampère
[ ampeer; French ahnper ]
/ ˈæm pɪər; French ɑ̃ˈpɛr /
noun
An·dré Ma·rie [ahndrey muhree; French ahndrey maree] /ˈɑn dreɪ məˈri; French ɑ̃ˈdreɪ maˈri/, 1775–1836, French physicist.
Related forms
Am·per·i·an [ampeereeuh n, per] /æmˈpɪər i ən, ˈpɛr/, adjectiveDictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for ampere
British Dictionary definitions for ampere (1 of 2)
ampere
/ (ˈæmpɛə) /
noun
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: ampSymbol: A
Word Origin for ampere
C19: named after André Marie Ampère
British Dictionary definitions for ampere (2 of 2)
Ampère
/ (ˈæmpɛə, French ɑ̃pɛr) /
noun
André Marie (ɑ̃dre mari). 1775–1836, French physicist and mathematician, who made major discoveries in the fields of magnetism and electricity
Collins English Dictionary  Complete & Unabridged 2012 Digital Edition
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Medicine definitions for ampere
ampere
[ ăm′pîr′ ]
n.
A unit of electric current in the meterkilogramsecond system, equal to the current that, flowing in two parallel wires one meter apart, produces a force of 2 X 107 newtons per meter.
A unit in the International System specified as one International coulomb per second and equal to 0.999835 ampere.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Science definitions for ampere (1 of 2)
ampere
[ ăm′pîr′ ]
The SI unit used to measure electric current. Electric current through any given crosssection (such as a crosssection of a wire) may be measured as the amount of electrical charge moving through that crosssection in one second. One ampere is equal to a flow of one coulomb per second, or a flow of 6.28 X 1018 electrons per second.
Science definitions for ampere (2 of 2)
Ampère
[ ăm′pîr′, ämpĕr′ ]
French mathematician and physicist who is best known for his analysis of the relationship between magnetic force and electric current. He formulated Ampère's law, which describes the strength of the magnetic field produced by the flow of energy through a conductor. The ampere unit of electric current is named for him.
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.