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
Correct options are A) , B) and D) As we know that Power=Irms2R So to decrease power loss Irms, and R must be lower for a constant power supply. To decrease Irms,Vrms must be increased by step up transformer to get same power in step up transformer Output power = Input power VSIS=VPIP ∵VS>VP so IP3+IS so loss of power during transmission become lower. We can again reduce voltage by using step down transformer.
