Wiring and stuff 2

A fuse is a thin piece of wire that...
allows a current to flow through it
1 of 30
Above a certain value, the fuse...
overheats and melts
2 of 30
The wire burning is safer as...
it doesn't burn the whole appliance
3 of 30
It prevents more current to...
flow through the appliance
4 of 30
Plugs, sockets and cables and appliances are made of...
hard-wearing electrical insulators
5 of 30
Sockets are made out of...
stiff plastic materials with wires inside
6 of 30
The longest pin of a three pin plug is designed so that it will...
make contact with the earth wire of a wall socket circuit
7 of 30
This is so that when you plug in an appliance with a metal casing to a wall socket...
the case is automatically earthed
8 of 30
plugs have cases made out of...
stiff plastic
9 of 30
The pins are made of brass because...
it is a good conductor and doesn't rust/oxidise
10 of 30
The inside of the case is shaped so that...
the wires and pins cannot touch each other when the plug is sealed
11 of 30
The fuse placed between the live pin and the live wire will...
cut the live wire off if there is too much current passing through it
12 of 30
Cables used for mains appliances consist of two or three...
insulated copper wires surrounded by an outer layer of rubber or flexible plastic material
13 of 30
Copper is a...
good conductor
14 of 30
Plastic is a good insulator and prevents...
anyone touching the cable (prevents electric shocks)
15 of 30
Two-core cables are used for appliances which have...
plastic cases
16 of 30
The LIVE wire is connected to the...
live pin
17 of 30
The NEUTRAL wire is connected to the...
neutral pin
18 of 30
The EARTH wire is connected to the...
earth pin
19 of 30
The Earth Wire is not connected to the...
20 of 30
The Earth Wire connects the metal casing of an appliance to...
the ground
21 of 30
This is so that if a fault appears in the live wire, and it somehow touches the casing...
it would become earthed
22 of 30
Too great a current would go in through the...
live wire, through the case and out down the earth wire to the ground.
23 of 30
The surge in the current melts the...
fuse (or tips the circuit breaker in the live wire)
24 of 30
This is when the amount of the current is...
greater than the fuse rating
25 of 30
This cuts off the live supply and...
breaks the circuit.
26 of 30
Why do appliances with double insulation not need an Earth Wire?...
There is no need for one as the case is made out of non-conducting plastic and if the faulty live wire touched the casing, there is hardly any risk as it is an insulator
27 of 30
A Residual Current Circuit Breaker (RCCB) is...
another type of circuit breaker
28 of 30
It works by detecting a difference in the current between the...
live and neutral wires
29 of 30
If the current somehow leaves the circuit causing the live wire to have a higher current than the fuse...
it will automatically switch the circuit off
30 of 30

Other cards in this set

Card 2


overheats and melts


Above a certain value, the fuse...

Card 3


it doesn't burn the whole appliance


Preview of the back of card 3

Card 4


flow through the appliance


Preview of the back of card 4

Card 5


hard-wearing electrical insulators


Preview of the back of card 5
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