mains electricity Flashcards
1
Q
neutral colour, use, voltage
A
- blue
- completes the circuit, when appliance is operating current flows it
- 0V
2
Q
live colour, use, voltage
A
- brown
- carries the alternating current from the supply
- 230V, current flows through it
3
Q
earth colour, use, voltage
A
- green and yellow stripes
- safety wire to stop the appliance becoming live
- doesn’t carry a current (only if a fault), 0V
4
Q
pd of each wire
A
neutral-0V
live-230V
earth-0V
5
Q
colour of each wire
A
neutral-blue
live-brown
earth-green/yellow
6
Q
why does touching the live wire give you an electric shock?
A
- body is at earth potential
- so large pd between live wire and you / earth
- current flows through you
- causes a large electric shock
7
Q
why are plug sockets still dangerous even if switched off?
A
-still a pd in the wire which can cause an electric shock
-if you touched the live wire your body would provide a link between the supply and the earth so a current would flow through you
8
Q
what is dangerous in terms of the earth and the live wire?
A
any connection as it provides a link in which a current will flow
9
Q
pd between live wire and earth
A
230V
