A transformer changes 12V to 18000V and there are 6000 turns in secondary coil. The number of turns in primary coil are:
Correct answer: D. 4
- A. 40
- B. 20
- C. 30
- D. 4
Explanation
4: If there are 4 turns in the primary coil, the voltage transformation ratio would be 6000/4 = 1500, which matches the given transformation ratio of 12V to 18000V. Therefore, the correct answer is "4" as the number of turns in the primary coil of the transformer is 4.
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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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