A transformer has 200 turns on the primary coil and 400 turns on the secondary. The primary voltage is 220 V. What is the secondary voltage?

Answer and explanation

Correct answer: D. 440 V

  1. Step 1: Vs/Vp = Ns/Np. Step 2. Vs = 220 × (400 ÷ 200) = 440 V. Answer: 440 V. Why not the others: 110 V is what you get if you invert the turns ratio. 222 V is what you get if you add instead of multiply. 4400 V is what you get if you misplace a power of ten.

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