The principal advantage of sending electric power across country on very high voltage transmission lines is that
A) they carry less energy per charge than low voltage transmission lines.
B) electric power lost in the wires is greatly reduced.
C) these transmission lines are less likely to get in the way than low voltage transmission lines-which are much closer to the ground.
D) they carry much more current than low voltage transmission lines.

Question

Quizplus · Accepted Answer

The principal advantage of using very high voltage for long-distance electric power transmission is that it reduces power loss in the wires. Power loss due to resistance in transmission lines is proportional to the square of the current (P = I^2R). By transmitting at high voltage and consequently lower current for the same power, the I^2R losses are significantly reduced.

The Principal Advantage of Sending Electric Power Across Country on Very