The National Grid is a network of pylons and cables that covers the whole of Britain, gettign electricity to homes all over the country.
Electricity gets around via the National Grid by...
1) The National Grid takes electrical energy from the power stations to just where is needed in homes and industry
2) It then enables power to be generated anywhere on the grid, and then it can be suplied anywhere else on the grid
3) To transmit the huge amount of power needed, you need either a high voltage or a high current
4) The problem with a high current is that you lose loads of energy through hjeat in the cables
5) Its much cheaper to boost the voltage up really high (to 400 000 V) and keep the current very low
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