A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction. It typically consists of two or more coils of wire (windings) wrapped around a magnetic core. By varying the voltage and current in one coil (primary), it induces a voltage in the other coil (secondary). Transformers are used to increase (step-up) or decrease (step-down) voltage levels, making them essential in power transmission, distribution, and many electronic applications.
Transformer