Which of the following transformers converts 220 V into 9 V?
Correct answer: C. A step-down transformer
- A. An ideal transformer
- B. A step-up transformer
- C. A step-down transformer
- D. An automatic transformer
Explanation
A step-down transformer is specifically designed to reduce voltage from a higher input (primary) to a lower output (secondary). In this case, it converts 220 V to 9 V, which is a reduction in voltage.
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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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