Step-up and step- down transformers are used in the national grid.
The National Grid allows distant power stations to be used to distribute electricity to consumers.
It allows a mix of different energy resources to be used efficiently to supply the country's electricity.
The grid will keep supplying electricity from other power stations if one of them breaks down.
The power station has a transformer that steps up the voltage and down the current.
The overhead cables have a relatively small current that can be distributed long distances.
The number of power stations needed is reduced by the amount of heat lost in the cables.
Coolkeeragh Power Station is the only major electricity generating station in Northern Ireland.
A power station has a current of 4 104 A.The voltage should be calculated.