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Concepts Of Physics MCQ Edition [Volume 2]PhysicsAlternating Current

Transformers are employed

Options

  1. Asolely in AC circuits
  2. Bin both DC and AC circuits
  3. Csolely in DC circuits
  4. Din neither DC nor AC circuits

Correct answer

A. solely in AC circuits

Step-by-step solution

A transformer operates on the principle of mutual induction, which requires a continuously changing magnetic flux to induce an electromotive force (EMF) in the secondary coil. In an AC circuit, the alternating current produces a varying magnetic field, allowing the transformer to function. In a DC circuit, the steady current produces a constant magnetic field, resulting in zero induced EMF in the secondary coil. Therefore, transformers are employed solely in AC circuits.

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