Question: Q. 2. The output of a step-down transformer is measured to be 24 V when connected to a 12 W Light bulb. The value of the peak current is (a) 1/2 A (b) 2 A (c) 2 A (d) 22 A

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Solution:

Ans. Correct option : (a)

Explanation : Given,

Power associated with secondary, Ps=12 W

Secondary voltage, Vs=24 V

Current in the secondary, Is=PsVs=1224=0.5 A

Peak value of the current in the secondary, I0=Is2=(0.5)(1.414)=0.707 or 12 A.

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