Multiple choice general knowledge science & technology

For which of the following purposes is a transformer used?

  1. conversion of low voltage into high voltage and vice versa

  2. conversion of DC into AC

  3. Regulation of fluctuation of voltage

  4. to store power
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A Correct answer
Explanation

A transformer changes AC voltage levels using electromagnetic induction between coils. It steps voltage up (increases) or down (decreases) while maintaining power (minus losses). Transformers cannot convert DC to AC (that requires an inverter) or store electrical energy.

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