Question

please explain transformer

Answer 1

transformer is an electrical device which convert alternating current at low voltage into that at high voltage.

Answer 2

Here is your answer

A transformer is a static electrical device that transfers electrical energy between two or more circuits through electromagnetic induction. A varying current in one coil of the transformer produces a varying magnetic field, which in turn induces a varying electromotive force or "voltage" in a second coil

Is is used to step up and step down the voltage

Hope it helps you