A transformer:
Correct answer: A. Works on A.C. only
- A. Works on A.C. only
- B. Works on both A.C and D.C
- C. Works on D.C only
- D. Has no hysteresis loss
Explanation
A transformer is an electrical device used to change a given alternating emf into a lame or small alternating emf. It works only on A.C.
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About Electromagnetic Induction
Changing magnetic flux induces an emf according to Faraday's law, while Lenz's law gives the direction that opposes the change producing it. Transformers apply induction between coils to step alternating voltage up or down, with turns ratio, current transformation and energy losses determining practical operation.
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