Question

Power $P$ is to be delivered to a device via transmission cables having resistance $R_C$. If $V$ is the voltage across $R$ and $I$ the current through it, find the power wasted and how can it be reduced.

Answer 1

The power is wasted in the form of heat through the resistance $R_C$ in the transmission cables.

$I$ is the current that flows through $R_C$.Therefore, the power wasted, $P_C=I^2{R}_c$

So, power depends upon $I^2$, therefore 𝐼 should be low and since,

$P=IV,V$ should be high

Therefore, for a constant value of power, magnitude of $I$ is low for a high magnitude of $V$ and magnitude of $I$ is high for a low magnitude of $V$.

Hence, in order to reduce wastage of power, magnitude of I should be low and magnitude of $V$ should be high.

Final Answer: Magnitude of$I$ should be low and magnitude of $V$ should be high.