A step down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44 W lamp. Ignoring power losses in the transformer, what - Physics MCQ NEET 2021 2026 | ExamTest.live

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A step down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44 W lamp. Ignoring power losses in the transformer, what is the current in the primary circuit?

Solution & Step-by-step Explanation

For an ideal transformer, Input Power = Output Power. V_{p} I_{p} = P_{o u t} 220 \times I_{p} = 44 I_{p} = \frac{44}{220} = \frac{1}{5} = 0.2 A

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A step down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44 W lamp. Ignoring power losses in the transformer, what is the current in the primary circuit?

2 A

4 A

0.2 A

0.4 A

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