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NEET 2007 (AIPMT) · AC Generator & Transformer

AC Generator & Transformer question from NEET 2007 (AIPMT)

Q53NEET 2007 · AIPMTEasy

AC Generator & Transformer

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

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Answer: (b)

$P_{in} = 220 \times 0.5 = 110\text{ W}$ , $P_{out} = 100\text{ W}$
$\eta = \dfrac{100}{110} \approx 0.91 \approx 90\%$
So the answer is (b) 90%.

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