National grid

Cards (13)

Name the complex order of transmission of electricity
Power stations —> Step-up transformer —> Pylons —> Step-down transformer —> Towns/Cities
Where is most electricity generated?
In power stations
Name the role of the national grid
To transmit huge amounts of power
What do step-up transformers do?
-minimize enery loss during transmission
-increases the voltage to around 400,000V
-decreases current
What do step-down transformers do?
-reduces voltage back down to 230V: makes voltage safer to use
-increases current before sending electricity to the town/city
Why is it important to keep a low voltage?
High voltage is dangerous
High voltage would blow the appliances in our houses
Name the 3 features in the National Grid in ORDER
step-up transformer
huge pylons
step-down transformer
Electrical energy depends on…
Demand - usually occurs late in the afternoon
Name the electric power formula
P = IV
power = current x voltage
Power stations need a lot of…
Spare capacity to be able to generate lots of electrical energy
What is high current caused by?
Lots of heat because of resistance
A high current results in…
Loss of energy to its surroundings
A low current results in…
High voltage