A transformer steps down from 200V to 50V. If it has a secondary winding of 40 turns, then the number of windings in the primary coil are:
Correct answer: B. 160
- A. 150
- B. 160
- C. 170
- D. 200
Explanation
As given,Vp = 200V, Vs = 50V, Ns = 40According to the transformer equation, Np/Ns = Vp/Vs Or, Np = Ns.Vp/VsPutting values, Np = (40 x 200) / 50 = 160Hence, option B is the correct option.
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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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