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Physics-

General

Easy

Question

A step-down transformer is connected to $2400 blank v o l t s$ line and 80 amperes of current is found to flow in output load. The ratio of the turns in primary and secondary coil is 20:1. If transformer efficiency is 100%, then the current flowing in primary coil will be

$1600 A$
$20 A$
$4 A$
$1.5 A$

The correct answer is: $4 blank A$

$fraction numerator N subscript s end subscript over denominator N subscript p end subscript end fraction equals fraction numerator V subscript s end subscript over denominator V subscript p end subscript end fraction rightwards double arrow fraction numerator 1 over denominator 20 end fraction equals fraction numerator V over denominator 2400 end fraction rightwards double arrow V subscript s end subscript equals 120 blank V$
For 100% efficiency $V subscript s end subscript i subscript s end subscript equals V subscript p end subscript i subscript p end subscript$
$rightwards double arrow 120 cross times 80 equals 2400 blank i subscript p end subscript rightwards double arrow i subscript p end subscript equals 4 blank A$

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