Question

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

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is C Assertion is correct but Reason is incorrect

Let the power to be transmitted be $P$ with the voltage $V$. The resistance of the transmission line be $R$

From equation $P=VI$ $⟹I=\frac{P}{V}$

$⟹$ $I\propto \frac{1}{V}$

Hence high voltage implies low current. Thus reason statement in incorrect

Power loss during the transmission $P_{loss}=I^{2}R=\frac{P^{2}R}{V^2}$

$⟹$ $P_{loss}\propto \frac{1}{V^2}$ ($R$ and $P$ are constant)

Hence, high voltage ensure minimum loss in the power during transmission which proves to be advantageous. Thus Assertion statement is correct.