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Physics-

General

Easy

Question

The number of turns in primary coil of a transformer is 20 and the number of turns in the secondary is 10. If the voltage across the primary is 220 V, what is the voltage across the secondary?

110 V
130 V
190 V
310 V

The correct answer is: 110 V

Given, $N subscript P end subscript equals 20 comma blank N subscript S end subscript equals 10 comma e subscript p end subscript equals 220 V$
$therefore$ Transformation ratio, k
$fraction numerator e subscript s end subscript over denominator e subscript p end subscript end fraction equals fraction numerator N subscript s end subscript over denominator N subscript p end subscript end fraction$
or $e subscript s end subscript equals fraction numerator N subscript s end subscript over denominator N subscript p end subscript end fraction cross times e p$
$equals fraction numerator 10 over denominator 20 end fraction cross times 220 equals 110 blank V$

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