WAEC Physics 2014 Objective — Question 45
Question 45 of 50 from the West African Examinations Council (WAEC) Physics 2014 Objective paper, with the correct answer and a full explanation.
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A transformer has 400 turns of wire in the primary coil and 40 turns in the secondary coil. If the input voltage is 150 volts, calculate the magnitude of the output voltage.
- A. 150 V
- B. 55 V
- C. 36 V
- D. 15 VCorrect
Explanation
Vs/Vp = Ns/Np, so Vs = 150×(40/400) = 15V.
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