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JAMB Physics 1981 Question 47

Question 47

Electromagnetic Induction

A transformer has 300 turns of wire in the primary coil and 30 turns in the secondary coil. If the input voltage is 100 volts, the output voltage is

  1. A.5 volts
  2. B.10 volts
  3. C.15 volts
  4. D.20 volts
  5. E.25 volts
Show the answer and explanation

Answer: B (10 volts)

Explanation

Vs/Vp = Ns/Np, so Vs = 100 × 30/300 = 10 V.