Electricity and the National Grid

Electricity is distributed via the national grid.
The national grid is a system of power stations, step up transformers, step down transformers and power lines.
The national grid takes electrical energy generated by power stations to where it's needed in homes and industry.
It enables energy to be generated anywhere on the grid and then supplied to anywhere else on the grid.
To transmit the huge amount of power needed, you either need a high voltage or a high current.
The problem with a high current is that you lose a lot of energy through hear in the cables.
It's much more efficient to increase the voltage rather than the current.
To get the voltage up to 400, 00 volts to transmit power requires transformers as well as pylons with huge insulators - but it's still cheaper and more efficient.
The transformers have to…

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