|1.||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|
|2.||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|
|[C19: named after André Marie |
ampere am·pere (ām'pēr')
A unit in the International System specified as one International coulomb per second and equal to 0.999835 ampere.
|ampere (ām'pîr') Pronunciation Key
The SI unit used to measure electric current. Electric current through any given cross-section (such as a cross-section of a wire) may be measured as the amount of electrical charge moving through that cross-section in one second. One ampere is equal to a flow of one coulomb per second, or a flow of 6.28 × 1018 electrons per second.
|Ampère (ām'pîr', äm-pěr') Pronunciation Key
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.