ampere

noun
am·pere | \ˈam-ˌpir also -ˌper \

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 \

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," 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.

See More

First Known Use of ampere

Noun

1881, in the meaning defined at sense 1

History and Etymology for ampere

Noun

André-Marie Ampère

Keep scrolling for more

Learn More about ampere

Statistics for ampere

Look-up Popularity

Time Traveler for ampere

The first known use of ampere was in 1881

See more words from the same year

Keep scrolling for more

More Definitions for ampere

ampere

noun

English Language Learners Definition of ampere

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

ampere

noun
am·pere | \ˈam-ˌpir \

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

Keep scrolling for more

Comments on ampere

What made you want to look up ampere? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

not any or not one

Get Word of the Day daily email!

Test Your Vocabulary

Great Scrabble Words—A Quiz

  • scrabble-tiles-that-read-scrabble-quiz
  • Which of the following Q-without-U words means the number five in cards or dice?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!