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.
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
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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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