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Physics-

General

Easy

Question

A generator at a utility company produces 100 A of current at 4000 V. The voltage is stepped up to 240000 V by a transformer before it is sent on a high voltage transmission line. The current in transmission line is

3.67 A
2.67 A
1.67 A
2.40 A

The correct answer is: 1.67 A

For step-up transformer,
$V subscript s end subscript greater than V subscript p end subscript blank a n d blank I subscript s end subscript less than I subscript p end subscript$
For an ideal transformer,
$V subscript s end subscript I subscript s end subscript equals V subscript p end subscript I subscript p end subscript$
$therefore 240000 I subscript s end subscript equals 100 cross times 4000$
or $I subscript s end subscript equals 1.67 blank A$

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