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JAMB Physics 2006 Question 23

Question 23

Electromagnetic Induction

The main purpose of the transformer in an a.c. radio set is to

  1. A.increase power to the radio.
  2. B.convert energy from a.c. to d.c.
  3. C.step down the voltage.
  4. D.step up the voltage.
Show the answer and explanation

Answer: C (step down the voltage.)

Explanation

A radio works on a low voltage, so its transformer steps the mains voltage down. A transformer cannot increase power or change a.c. to d.c.