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Unilorin Post-UTME Physics 2024 (Model questions) Question 9

Question 9

Electromagnetic Induction

A transformer has 500 turns in the primary coil and 100 in the secondary. If the primary voltage is 220V, what is the secondary voltage?

  1. A.44V
  2. B.110V
  3. C.330V
  4. D.1100V
Show the answer and explanation

Answer: A (44V)

Explanation

Vs/Vp = Ns/Np, so Vs = 220 × 100 ÷ 500 = 44 V (a step-down transformer).