An ideal transformer is one in which
Correct answer: A. the output power equals the input power
- A. the output power equals the input power
- B. the output voltage equals the input voltage
- C. the output current equals the input current
- D. no flux passes through the core
Explanation
Ideal means lossless, so all the power delivered to the primary appears at the secondary, and voltage and current change in inverse proportion. Real transformers approach 98 per cent efficiency but lose a little to eddy currents, hysteresis, resistance in the windings and flux leakage. A transformer never changes the frequency.
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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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