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National Grid P1

What is the national grid? The network of pylons and cables covering Britain, taking electricity from power stations and other sources and distributing it to homes and businesses
What are the jobs of transformers? To increase or decrease the voltage to the level suitable for either transporting across the wires or providing it at a safe suitable level
What does a step up transformer do? Increases the voltage coming from a power station to 400,000 volts so it can be quickly and cheaply carried around the network of wires
What does a step down transformer do? Decrease the voltage to safe usable levels so that consumers (towns. villages etc.) can use it for power
Pros of overhead cables?(4) • Cheaper • Easily accessible • Easily set up • Minimal disturbance to land
Cons of overhead cables(4) • Lots needed • Ugly • Affected by weather • Less relaiable
Pros and cons of underground cables? Its the opposite to overhead cables
How can supply be increased? More power stations or more output
How can demand be decreased? Consumers using more energy efficient appliances
Created by: GuyBrazier