Get premium membership and access revision papers with marking schemes, video lessons and live classes.
Processing. Please wait.

 Form 4 Physics Mains Electricity online video lessons.

Meaning of Grid input as used in mains electricity

 (1m 40s)
807 Views     SHARE

Download as pdf file

Answer Text:
Grid input
-At the generating plant the power is produced at a relatively low voltage of up to 25 kV then stepped up by the power station transformer up to 400 kV for transmission. It is transmitted by overhead cables at high voltage to minimize energy losses.
-The cables are made of aluminium because it is less dense than copper. Metallic poles (pylons) carry four cables, one for each phase and the fourth is the neutral cable which is thinner and completes the circuit to the generator.