national grid Flashcards
(5 cards)
1
Q
what is the national grid
A
distributes electricity across UK
2
Q
what do step up transformers do
A
increase voltage , decrease current
3
Q
what do step down transformers do
A
decrease voltage , increase current
4
Q
describe how electricity gets to our homes
A
electricity first gets generated in power stations then it gets sent to step up transformers which increase voltage and decrease current to 400,000V means less energy is lost as heat in transmission cables. then it gets sent to step down transformers which decrease the voltage and increase current to 230V before it gets to our homes
5
Q
why do we have to decrease the voltage before it gets to our homes
A
because more voltage can blow up our appliances and its dangerous
