NEET 2023, Physics Q12: Faraday’s Law of Induction

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Q.

A $12$ V, $60$ W lamp is connected to the secondary of a step down transformer, whose primary is connected to ac mains of $220$ V. Assuming the transformer to be ideal, what is the current in the primary winding?

A
$2.7$ A
B
$3.7$ A
C
$0.37$ A
D
$0.27$ A

Solution

An ideal transformer conserves power: $V_{p} I_{p} = V_{s} I_{s} = P_{l am p}$ .

$I_{p} = \frac{P}{V _{p}} = \frac{60}{220} \approx 0.27$ A.

Concept behind this question

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