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JAMB Physics 2005 Question 1

Question 1

Electromagnetic Induction

A transformer is rated 240 V. If the primary coil is 4000 turns and the secondary voltage 12 V, determine the number of turns in the secondary coil.

  1. A.250.
  2. B.100.
  3. C.150.
  4. D.200
Show the answer and explanation

Answer: D (200)

Explanation

Ns/Np = Vs/Vp, so Ns = 4000 × 12/240 = 200.