electricity in the home Flashcards
1
Q
alternating current
A
current from mains supply repeatedly reverses its direction
1
Q
direct current
A
cells and batteries supply current that passes round the circuit in one direction
1
Q
frequency
A
rate at which alternating current reverses its direction
2
Q
national grid
A
a system of cables and transformers linking power stations to consumers
3
Q
step up transformers
A
used to increase the p.d. from the power station to the transmission cables
3
Q
step down transformers
A
used to decrease the p.d. to a much lower value for domestic use
4
Q
earth wire
A
yellow and green
5
Q
live wire
A
brown
6
Q
neutral wire
A
blue
7
Q
plug pins are made of..
A
brass
8
Q
what measures how much householders pay for the amount of electrical energy they use
A
domestic electricity meter
