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 - Physics MCQ NEET 2023 2026 | ExamTest.live

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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?

Solution & Step-by-step Explanation

For an ideal transformer, Input Power = Output Power. P_{p r ima ry} = P_{seco n d a ry} V_{p} I_{p} = P_{o u t} Given: P_{o u t} = 60 W V_{p} = 220 V $ 220 \times I_{p} = 60 $ I_{p} = \frac{60}{220} = \frac{3}{11} \approx 0.2727 A \approx 0.27 A

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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?

0.27 A

2.7 A

3.7 A

0.37 A

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