P2 : National Grid

Question 1

What is the national grid made up of

Answer 1

Transformers and transmission cables
After a power station is a step-up transformer. This increases voltage but decreases current, this reduces energy lost to heating in the cables ,along transmission of electricity efficient.
Cables are also low resistance to reduce energy loss, before electricity is delivered to consumers, it goes to a a step-down transformer reducing voltage to a safe level