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==Key Stage 4==
===Meaning===
The '''national grid''' is a network of [[Power Station|power stations]], [[Transmission Line|transmission lines]] and [[Electrical Transformer|transformers]] which generate and transmit [[electricity]] across the [[United Kingdom]].
===About The National Grid===
#[[Electrical Transformer#Step Up|Step Up Transformer]] - The [[Potential Difference|potential difference]] of the [[electricity]] is increased to around 400kV for long distance transmission. This is because the higher [[Potential Difference|potential difference]] means a lower [[Electrical Current|current]] so less [[energy]] will be dissipated through heating the [[Transmission Line|transmission lines]].
#Long Distance [[Transmission Line]]s - [[Electricity]] is transmitted at very high [[Potential Difference|potential difference]] (400kV) so it is kept on very high [[Transmission Line|transmission lines]].
#[[Electrical Transformer#Step Down|Step Down Transformer]] - The [[Potential Difference|potential difference]] of the [[electricity]] is lowered to be sent to [[factory|factories]] and neighbourhoods at 33kV.
#Short Distance [[Transmission Line]]s - [[Electricity]] is transmitted at 33kV over a short distance.
#Neighbourhood [[Electrical Transformer#Step Down|Step Down Transformer]] - The [[Potential Difference|potential difference]] is lowered to 230V for use in houses.