MCQ
For two statements are given $-$ one labelled Assertion $(A)$ and the other labelled Reason $(R).$ Select the correct answer to these questions from the codes $\ce{(a), (b), (c)}$ and $(d)$ as given below :
Assertion : It is advantageous to transmit electric power at high voltage.
Reason : High voltage implies high current.
  • A
    Both $A$ and $R$ are true, and $R$ is correct explanation of the assertion.
  • B
    Both $A$ and $R$ are true, but $R$ is not the correct explanation of the assertion.
  • $A$ is true, but $R$ is false.
  • D
    $A$ is false, but $R$ is true.

Answer

Correct option: C.
$A$ is true, but $R$ is false.
As $P = Vi,$ hence, for the transmission of same power, high voltage implies less current. Therefore, heat energy losses $\Big(\text{H} = \text{i}^2 \frac{\text{Rt}}{4.2}\Big)$ are minimized if power is transmitted at high voltage.

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