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Question

# In a step-down transformer having primary to secondary turns ratio of 20:1, the input voltage applied is 250 V and output current is 8 A. Assuming 100% efficiency, calculate current in the primary coil and the output power.

A
0.4 A, 100 W
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B
0.8 A, 200 W
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C
0.2 A, 50 W
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D
0.1 A, 50 W
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Solution

## The correct option is A 0.4 A, 100 WUsing ideal conditions and transformer equation, we have IpIs=NsNp ⇒Ip=NsNp×Is Substituting the values, ⇒Ip=120×8=0.4 A Since. the transformer is ideal, ∴Output power = Input power Ps=Pp=VpIp ⇒Ps=250×0.4=100 W Hence, option (A) is correct.

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