A transformer is a device that
A) increases the power level of a circuit.
B) operates only on AC.
C) operates on either DC or AC.
D) operates only on DC.

Question

Quizplus · Accepted Answer

Transformers operate only on alternating current (AC) because their function relies on the changing magnetic field created by AC to induce a current in another coil, thereby transferring energy from one circuit to another. DC does not create a changing magnetic field, so transformers cannot work with direct current (DC).

A Transformer Is a Device That