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JAMB Physics 2004 Question 30

Question 30

Electromagnetic Induction

A generator-manufacturing company was contracted to produce an a.c dynamo but inadvertently produced a d.c. dynamo. To correct this error, the

  1. A.commutator should be replaced with slip rings.
  2. B.commutator should be replaced with split rings.
  3. C.armature coil should be made of aluminium.
  4. D.armature coil should be made of silver.
Show the answer and explanation

Answer: A (commutator should be replaced with slip rings.)

Explanation

A d.c. dynamo uses a split-ring commutator; replacing it with slip rings gives alternating current.