Question

The purpose of transmitting power at high voltage (100-500 kV) from a generation station through overhead or underground transmission lines to substations is to

Select one:

a. increase transmission frequency.

b. increase energy efficiency.

c. increase current amplitude.

d. increase electrical resistance.

Answer 1

Answer is b

The primary reason that power is transmitted at high voltages is to increase efficiency. As electricity is transmitted over long distances, there are inherent energy losses along the way. High voltage transmission minimizes the amount of power lost as electricity flows from one location to the next. The higher the voltage, the lower the current. The lower the current, the lower the resistance losses in the conductors. And when resistance losses are low, energy losses are low also.