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Efficiency of the transformer η = (Poutput / Pinput) × 100. If Poutput = 100 W and Pinput = 220 × 0.5 W, calculate η.

1. 90.9%
2. 80%
3. 85%
4. 95%

Correct answer: 90.9%

Solution

The input power is Pinput = 220 × 0.5 = 110 W. The efficiency is η = (Poutput / Pinput) × 100 = (100 / 110) × 100 = 90.9%.

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