- 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…