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Physics-

General

Easy

Question

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

5.0 ampere
3.6 ampere
2.8 ampere
2.5 ampere

The correct answer is: 5.0 ampere

$eta equals fraction numerator V subscript s end subscript I subscript s end subscript over denominator V subscript p end subscript I subscript p end subscript end fraction equals 0.8 rightwards double arrow I subscript P end subscript equals fraction numerator left parenthesis 440 right parenthesis left parenthesis 2 right parenthesis over denominator left parenthesis 0.8 right parenthesis left parenthesis 220 right parenthesis end fraction equals 5 blank A$

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