Q104 / 180 · AIIMS 2010 · Physics

Assertion : It is advantageous to transmit electric power at high voltage. Reason : High voltage implies high current.

A
If both assertion and reason are true and reason is the correct explanation of assertion
B
If both assertion and reason are true but reason is not the correct explanation of assertion
Correct answer
C
If assertion is true but reason is false
D
If both assertion and reason are false.

Solution

As $P=V i$, hence for the transmission of same power, high voltage implies less current. Therefore heat energy loses $\left(H=i^2 R t / 4.2\right)$ are minimized if power is transmitted at high voltage.

Hence, the correct answer is option: 'C'.

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