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Q.

A power transformer is used to step up an alternating e.m.f. of 220 V to 11 kV to transmit 4.4 kW of power. If the primary coil has 1000 turns, what is the current rating of the secondary ? Assume 100% efficiency for the transformer

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a

4 A

b

0.4 A

c

0.04 A

d

0.2 A

answer is B.

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is=PsVs=4.4×10311×103=0.4 A
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