national grid

Question 1

what is the national grid a system of?

Answer 1

the national grid is a system of transformers and high voltage cables

Question 2

why is energy always lost in the power of cables

Answer 2

energy is always lost in the power of cables due to the resistance of wires

Question 3

how to reduce energy loss in cables

Answer 3

use transformers

Question 4

explain how transformers reduce energy loss in cables

Answer 4

• electricity passes through a step-up transformer which increases the potential difference to several hundred thousand volts
• less energy is lost in the power cables when the potential difference is very high
• the energy is then passed through high voltage wires
• electricity passes through a step down transformers which reduce the potential difference to 230 volts
• this is then sent into homes