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Physics-

General

Easy

Question

A 100% efficient transformer has 100 turns in the primary and 25 turns in its secondary coil. If the current in the secondary coil is 4 amp, then the current in the primary coil is

$1 a m p$
$4 a m p$
$8 a m p$
$16 a m p$ .

The correct answer is: $1 blank a m p$

For 100% efficient transformer
$V subscript s end subscript i subscript s end subscript equals V subscript p end subscript i subscript p end subscript rightwards double arrow fraction numerator V subscript s end subscript over denominator V subscript p end subscript end fraction equals fraction numerator i subscript p end subscript over denominator i subscript s end subscript end fraction equals fraction numerator N subscript s end subscript over denominator N subscript p end subscript end fraction rightwards double arrow fraction numerator i subscript p end subscript over denominator 4 end fraction equals fraction numerator 25 over denominator 100 end fraction rightwards double arrow i subscript p end subscript equals 1 blank A$

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