A transformer with 1000 primary turns and 100 secondary turns is supplied at 220 V. The secondary voltage is
Correct answer: B. 22 V
- A. 2200 V
- B. 22 V
- C. 220 V
- D. 2.2 V
Explanation
The turns ratio is 10 to 1 down, so the voltage falls by the same factor, from 220 V to 22 V. If the transformer is ideal the secondary current is ten times the primary current, keeping the power the same on both sides. Multiplying instead of dividing gives the 2200 V distractor.
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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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