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JAMB Physics 1993 Question 43

Question 43

Electromagnetic Induction

Which of the following devices may be used to step up the voltage in a d.c. circuit?

  1. A.A step-up transformer
  2. B.A d.c. generator
  3. C.A wattmeter
  4. D.An induction coil.
Show the answer and explanation

Answer: D (An induction coil.)

Explanation

A transformer needs a.c. An induction coil uses a make-and-break switch to interrupt the d.c., producing a high induced voltage.