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Question

A step-down transformer reduces the voltage of a transmission line from 2200 V to 220 V. The power delivered by it is 880 W and its efficiency is 88%. The input current is :

A
4.65 mA
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B
0.045 A
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C
0.45 A
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D
4.65 A
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Solution

The correct option is A 0.45 A
Efficiency of transformer,
η=Output powerInput power
88100=880Pi
Pi=1000 W
Input current, Ip=PiVi
=10002200
=0.45 A.

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