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.
This question appeared on the NUMS 2021 paper, which you can sit online with every answer explained.
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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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