plural amperes
Definition of ampere
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 defined by setting the fixed numerical value of the elementary charge to 1.602176634 x 10-19 ampere seconds
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Merriam-Webster unabridged
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Time Traveler for ampere
The first known use of ampere was in 1881
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