Q.

A step-down transformer is used on a 1000 V line to deliver 20 A at 120 V at the secondary coil. If the efficiency of the transformer is 80% the current drawn from the line is .

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a

3 A

b

30 A

c

0.3 A

d

2.4 A

answer is A.

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Detailed Solution

η= Output  Input ⇒80100=120×201000×il⇒il=20×120×1001000×80=3A.
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A step-down transformer is used on a 1000 V line to deliver 20 A at 120 V at the secondary coil. If the efficiency of the transformer is 80% the current drawn from the line is .