A transformer is used to light a 100 W and 110V
lamp from a 220V mains. If the main current is
0.5 amp, the efficiency of the transformer is
approximately-

10%

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30%

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50%

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90%

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Solution

The correct option is D 90%
The efficiency of transformer
$η = \frac{V_{s} I_{s}}{V_{p} I_{p}} \times 100 = \frac{100}{220 \times 0.5} \times 100 \approx 90$

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