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National Grid P1
| Question | Answer |
|---|---|
| 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
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