To reduce energy loss through heat, long distance transmission lines use...?

Question

(a) reduced energy

(b) increased current

(c) increased frequency

(d) reduced current

(e) decreased frequency

Answer 1

(d) reduced current.

The loss is proportional to the square of the current, so they raise the voltage and drop the current.

Answer 2

(d) Reduced current.

Energy loss (Heat) = I^2 * R where I is the current and R is the resistance. Reducing I reduces enrgy loss.

In order to transmit power = V * I   (V is voltage), V is high. This is the reason power lines have high voltage e.g. 50000 volts