Multiple choice

A transformer is used to

  1. increase DC voltage

  2. increase or decrease AC voltage

  3. decrease DC voltage

  4. convert DC into AC
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Transformers work on the principle of electromagnetic induction, which requires a changing magnetic field. This is why transformers only function with alternating current (AC), allowing voltage to be stepped up or down. DC voltage cannot be transformed directly - it requires electronic converters.

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