National Grid Flashcards
1
Q
What is the national grid
A
A system of cables and transformers linking power stations to consumers across the uk
2
Q
What do transformers do
A
- Change the potential difference
3
Q
What are step up transformers
A
- increase the pd from the power station to the National grid
- as power constant (p=IV) current decreases so less energy lost
4
Q
What are step down transformers
A
- decrease the pd
- from the national grid to consumers
- for consumer safety
5
Q
What happens when a high current flows through a wire
A
Generates lots of heat because of the resistance meaning we’d lose lots of energy to surroundings
6
Q
What voltages is it steped up to
A
400000v
7
Q
What voltage is steped down
A
230v
8
Q
How do wires transmit the electricity
A
Using pylons
9
Q
Why is it important that voltage is lowered
A
- dangerous
- blow the appliances in our houses
