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
Last updated
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.
Practise Electromagnetic Induction
288 free Electromagnetic Induction MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.