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 if, find the power wasted and how can it be reduced.

The power consumption in transmission lines is given by P =${{i}^{2}}$ $R_{ c }$, where $R_{ c }$ is the resistance of transmission lines. The power is given by P = VI

The given power can be transmitted in two ways namely:

(i) At low voltage and high current.

(ii) At high voltage and low current.

Iff power transmission at low voltage and high current, more power is wasted as P∝${{i}^{2}}$, whereas power transmission at high voltage and low current facilitates the power transmission with minimum power wastage.Thus, power wastage can be reduced by

transmitting power at high voltage