An ideal transformer steps up or steps down:
Correct answer: B. AC voltage
- A. Energy
- B. AC voltage
- C. DC voltage
- D. Power
Explanation
An ideal transformer steps up or steps down AC voltage using the principle of electromagnetic induction. It consists of primary and secondary coils wound around a magnetic core. When AC voltage is applied to the primary coil, it creates a changing magnetic field, which induces an electromotive force (emf) in the secondary coil, altering the voltage. Transformers do not work with DC voltage because direct current does not produce a changing magnetic field. Additionally, while they can change voltage and current levels, the power transferred remains constant, assuming no energy losses, as per the conservation of energy principle.
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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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