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Alternating Current and Direct Current

Why is AC pre...

Question

Why is AC preferred over DC for transmission of electrical power

A

AC to DC conversion and vice versa is very easy

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B

Transmission losses in AC are lower

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C

AC transmission is unaffected by random phase change

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D

Frequency of AC do not change

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Solution

The correct option is D Transmission losses in AC are lower
Transmission losses are given as $I^{2} R$ . In AC, voltage transformation to higher(and also lower) values is easier at constant power. So, voltage is increased before transmission reducing current and hence reducing transmission losses.

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