Which of the following remains unchanged in a transformer.
Correct answer: C. Power
- A. Voltage
- B. Current
- C. Power
- D. Capacitance
Explanation
A transformer changes voltages and current but the power remains constant. But we would like to mention that this is only for the case of an ideal transformer, in general there is loss in power in form of heat, sound, vibrations, eddy currents, etc. Only the frequency remains constant.In an ideal transformer, power remains constant as it is not lost to the surroundings
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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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