ampere

noun
am·​pere | \ ˈam-ˌpir also -ˌper How to pronounce ampere (audio) \

Definition of ampere

 (Entry 1 of 2)

1 : the practical meter-kilogram-second unit of electric current that is equivalent to a flow of one coulomb per second or to the steady current produced by one volt applied across a resistance of one ohm
2 : the base unit of electric current in the International System of Units that is equal to a constant current which when maintained in two straight parallel conductors of infinite length and negligible circular sections one meter apart in a vacuum produces between the conductors a force equal to 2 × 10−7 newton per meter of length

Ampère

biographical name
Am·​père | \ äⁿ-ˈper How to pronounce Ampère (audio) \

Definition of Ampère (Entry 2 of 2)

André-Marie 1775–1836 French physicist

Examples of ampere in a Sentence

Noun

a current of 15 amperes

Recent Examples on the Web: Noun

Each bolt contained about 10,000 amperes of current at its peak. Eric Berger & Lee Hutchinson, Ars Technica, "The Greatest Leap, part 5: Saving the crew of Apollo 13," 20 July 2019 Each bolt contained about 10,000 amperes of current at its peak. Eric Berger & Lee Hutchinson, Ars Technica, "The Greatest Leap, part 5: Saving the crew of Apollo 13," 20 July 2019 Each bolt contained about 10,000 amperes of current at its peak. Eric Berger & Lee Hutchinson, Ars Technica, "The Greatest Leap, part 5: Saving the crew of Apollo 13," 6 Feb. 2018 The review concerns a potential redefinition of the ampere (a unit of electricity), the kelvin (temperature), the mole (measurement of atoms and or molecules) and the kilogram. David Grossman, Popular Mechanics, "These Basic Units of Measurement Could Change in 2018," 20 Oct. 2017 Cables could power connected devices with as much as 1.5 amperes of electrical current (at up to 30 volts). Richard C. Moss, Ars Technica, "The tragedy of FireWire: Collaborative tech torpedoed by corporations," 22 June 2017 Another major electrical unit, the current-measuring ampere, takes its name from this French physicist. Bill Andrews, Discover Magazine, "The Names Behind the Units of Measure," 10 Apr. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'ampere.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of ampere

Noun

1881, in the meaning defined at sense 1

History and Etymology for ampere

Noun

André-Marie Ampère

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Statistics for ampere

Last Updated

22 Aug 2019

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Time Traveler for ampere

The first known use of ampere was in 1881

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More Definitions for ampere

ampere

noun

English Language Learners Definition of ampere

technical : a unit for measuring the rate at which electric current flows

ampere

noun
am·​pere | \ ˈam-ˌpir How to pronounce ampere (audio) \

Kids Definition of ampere

: a unit for measuring the strength of an electric current

ampere

noun
am·​pere | \ ˈam-ˌpi(ə)r also -ˌpe(ə)r\

Medical Definition of ampere

1 : the practical mks unit of electric current that is equivalent to a flow of one coulomb per second or to the steady current produced by one volt applied across a resistance of one ohm
2 : the base unit of electric current in the International System of Units that is equal to a constant current which when maintained in two straight parallel conductors of infinite length and negligible circular sections one meter apart in a vacuum produces between the conductors a force equal to 2 × 10−7 newton per meter of length

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More from Merriam-Webster on ampere

Rhyming Dictionary: Words that rhyme with ampere

Spanish Central: Translation of ampere

Nglish: Translation of ampere for Spanish Speakers

Britannica English: Translation of ampere for Arabic Speakers

Britannica.com: Encyclopedia article about ampere

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not constant or steady

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