elctricity Flashcards
1
Q
what does the live wire do?
A
it alternates between a high positive and negative voltage of about 230V
2
Q
what does the neutral wire do?
A
voltage always at 0
3
Q
what does the earth wore do?
A
and fuse/circuit breaker. they work together and are just for safety. they prevent fires and the risk of shocks.
4
Q
what is earthing?
A
appliances with metal cases must be earthed to reduce risk of electric shocks and fires. It is when you attach the metal casing to the earth wire. A strong current surges through the earth wire because it has a very low resistance. This breaks the fuse and disconnects the appliance.
5
Q
what is insulating?
A
if an appliance has a plastic casing it is said to be double insulated. double insulation doesn’t need an earth wire.
