Chapter 22, Problem 74A

To determine

The electric quantities to be kept small to transmit electrical energy economically over large distances.

Answer to Problem 74A

Current and resistance of the wire.

Explanation of Solution

Introduction:

The thermal loss through a wire in time $t$ is given by,

  $E=I^{2}Rt$

Where, Iis the current and R is the resistance.

To have a low thermal loss in transmitting energy, the current and the resistance of the wire must be kept low.

Conclusion:

Hence, current and resistance should be low to transmit electrical energy economically through a large distance.