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Q.

A 12 V, 60 W lamp is connected to the secondary of a step down transformer, whose primary is connected to ac mains of 220V. Assuming the transformers to be ideal, what is the current in the primary winding?

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a

3.7 A

b

0.27 A

c

2.7 A

d

0.37 A

answer is B.

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Detailed Solution

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As it is an ideal transformer
input power = output power.
60=220ii=60220=0.27A.

 

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