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JAMB Physics 1995 Question 47

Question 47

Electromagnetic Induction

The primary winding of a transformer has 400 turns and its secondary has 100 turns. If a source of e.m.f. of 12 V is applied to the primary, the secondary e.m.f. will be

  1. A.3 V
  2. B.6 V
  3. C.24 V
  4. D.48 V
Show the answer and explanation

Answer: A (3 V)

Explanation

Vs/Vp = Ns/Np, so Vs = 12 × 100/400 = 3 V.