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

Answer: (d). Ideal transformer: input power = output power, VpIp = 60 W. Ip = 60/220 ≈ 0.27 A So the answer is (d) 0.27 A.

A 12 V, 60 W lamp is connected to the secondary of a step down… | NEET 2023

Q31NEET 2023Easy

AC Generator & Transformer

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

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Answer: (d)

Ideal transformer: input power = output power, $V_pI_p = 60\text{ W}$ .
$I_p = \dfrac{60}{220} \approx 0.27\text{ A}$
So the answer is (d) 0.27 A.

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