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JAMB Physics 1981 Question 45

Question 45

Electromagnetic Induction

Which of the following is NOT directly associated with direct current (D.C.)?

  1. A.A dry cell
  2. B.A moving coil galvanometer
  3. C.A transformer
  4. D.A lead-acid accumulator
  5. E.A commutator
Show the answer and explanation

Answer: C (A transformer)

Explanation

A transformer works only with changing (alternating) current, because it relies on a changing magnetic flux.