The device which increases or decreases the emf is called:
Correct answer: C. Transformer
- A. AC generator
- B. Motor
- C. Transformer
- D. DC generator
Explanation
A transformer is a device which increases or decreases alternating voltage through mutual induction. It consists of two coils wound on the same code.
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About Transformers
Transformers transfer alternating electrical energy between coils by mutual induction, with voltage ratio determined by the turns ratio. The topic covers step-up and step-down transformers, current changes, ideal power conservation and practical losses such as heating and flux leakage. A transformer requires changing magnetic flux, so it does not operate with steady direct current.
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