An ampere (A) is the unit of electric current in the International System of Units (SI). It is defined as the flow of one coulomb of charge per second.
Coulomb: The SI unit of electric charge, defined as the quantity of electricity transported by one ampere in one second.
Ampère's Force Law: A principle that states that two parallel conductors carrying electric currents will exert a force on each other proportional to their lengths and currents.
Amperemeter (Ammeter): An instrument used to measure electric current in amperes.