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Question

Why is electric power transmitted over long distances at high voltage?

A
To minimize power loses due to Joule's heating
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B
To maximize power loses due to Joule's heating
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C
To balance power loses due to Joule's heating
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D
None
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Solution

The correct option is A To minimize power loses due to Joule's heating
For constant electric power, higher the voltage, lower is the current (as P=IV) through the wire. As power loss due to Joule's heating is proportional to I2, for a small current, power loss is also small. So, power is transmitted over long distances at high voltage to minimize power loses due to Joule's heating.

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