• A component or device which is utilized to transfer electrical energy from one circuit to another via magnetic or electromagnetic induction. A transformer has no moving parts and consists of two or more coils of wire separately wrapped around a magnetic core. The coils are inductively linked by magnetic lines of force, and do not come into physical contact. A transformer is usually utilized to change electrical energy at one AC voltage to another, with a step-down transformer providing an output voltage lower than its input voltage, and a step-up transformer providing an output voltage higher than its input voltage. The winding that is directly connected to the input power is the primary, while the winding or windings that provide the output to the load or loads are the secondaries. The output of a variable transformer can be adjusted between given values.

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