Electrical energy is transmitted over large distances at high alternating voltages.

Electrical energy is transmitted over large distances at high alternating voltages. Which of the following statements is (are) correct ? (a) For a given power level there is a lower current (b) Lower current implies less power loss (c) Transmission lines can be made thinner (d) It is easy to reduce the voltage at the receiving end using step-down transformers

Key concept : Power loss due to transmission lines having resistance (R) and I,rms, current flowing in the circuit is I,2, ,rms,R.,The power is to be transmitted over the large distances at high alternating voltages, so current flowing through the wires will be low bacause of given power (P).,For a given power level, we find that ,P = E,rms,I,rms,(I,rms, is low when E,rms, is high),Power loss = I,2,rms,R = low (,∵, I,rms, is low),Now at the receiving end high voltage is reduced by using step-down transformers.