the national grid Flashcards
1
Q
the national grid consists of ____________
A
transformers and high voltage cables
2
Q
why is energy lost in the power cables
A
its due to the resistance of the wires
the bigger the distance of the cable and homes, the greater the energy loss
3
Q
what do “step- up transformers” do? and why does it do that?
A
they increase the potential difference to several hundred thousand volts
(this is because less energy is lost in the power cables when the potential difference is very high)
4
Q
what does a step-down transformer do
A
when the electricity passes through step-down transformers, the potential difference is reduced before the electricity is passed to homes
