Definition of ampere
1 : the practical meterkilogramsecond 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
Examples of ampere in a sentence
a current of 15 amperes
Origin and Etymology of ampere
AndréMarie Ampère
First Known Use: 1881
Ampère
playDefinition of Ampère
AndréMarie 1775–1836 Fr. physicist
AMPERE Defined for English Language Learners
ampere
playDefinition of ampere for English Language Learners

: a unit for measuring the rate at which electric current flows
AMPERE Defined for Kids
ampere
playDefinition of ampere for Students
: a unit for measuring the strength of an electric current
Medical Dictionary
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
Biographical Note for ampere
Ampère
\äⁿper\play ,André Marie
(1775–1836), French physicist. Ampère is credited with founding, naming, and developing the science of electrodynamics. He was the formulator of two laws in electromagnetism relating magnetic fields to electric currents. The first person to develop techniques for measuring electricity, he invented an instrument that was a forerunner of the galvanometer. In 1881 at the suggestion of Sir Charles Bright, an international congress on electricity adopted ampere as a term for the standard unit of electric current.Learn More about 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
Seen and Heard
What made you want to look up ampere? Please tell us where you read or heard it (including the quote, if possible).
Writing? Check your grammar now!