text: Electric current is the rate of charge flow past a given point in an electric circuit, measured in coulombs/second which is named amperes.\n\nA transformer is an electrical device that transfers energy from one circuit to another by magnetic coupling with no moving parts. A transformer comprises two or more coupled windings, or a single tapped winding and, in most cases, a magnetic core to concentrate magnetic flux.  Transformers are used to convert between high and low voltages, to change impedance, and to provide electrical isolation between circuits.