Question

Why is power in transmission lines transmitted at high voltages if power loss is directly proportional to V²?

Answer 1

Voltage is the characteristic property of charge & it doesn't matter whether charge is in rest or in motion.

As we know that, resistance is only offered when charges are begins to move.

conductor having higher voltage simply lay there and will not do any work. hence no loss in energy.

when flow of current begins, offered resistance leads to power loss, i.e. power loss = i^2*R ........(1)

since we know,

Power, P = V*I ......(2)

in power transmission, voltage is much higher. hence from equation 2, current flow is very low. From equation 1, power loss is less.

thats the reason why power transmission takes place with higher voltage rather than with higher current.

{Note : Power loss is function of Current,I & resistance R, not Voltage,V & resistance R}