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

90%

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95%

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96%

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99%

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Solution

The correct option is B 90%
Here, primary voltage $V_{p} = 220 V$ and primary current $I_{p} = 0.5 A$ and output power $P = 100 W$
The efficiency of a transfer is $η = \frac{o u t p u t p o w e r}{i n p u t p o w e r} \times 100$
$= \frac{P}{V_{p} I_{p}} \times 100 = \frac{100}{220 \times 0.5} \times 100 = 90.9 \sim 90$ %

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