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Question

A 220 V input is supplied to a transformer. The output circuit draws a current of 2.0 A at 440 V. If the efficiency of the transformer is 80%, the current drawn by the primary windings of the transformer is

A
1 A
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B
1.25 A
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C
2.5 A
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D
5 A
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Solution

The correct option is D 5 A
Vp=220 V ; ip=? ; Vs=440 V ; is=2.0 A ; η=80%

Efficiency η=output powerInput power

From the data given in the question, 80 %=VsisVpip

ip=Vsis(80100)Vp=440×2×10080×220=5 A

Hence, option (a) is the correct answer.

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