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A transformer connected to a 220 V line shows an output of 2 A at 11,000 V. If the efficiency is 100%, the current drawn from the line is

1. 100 A
2. 200 A
3. 22 A
4. 11 A

Correct answer: 100 A

Solution

For an ideal transformer, input power equals output power. So 220 d7 I_p = 11000 d7 2 . Solving gives I_p = 100 A .

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