how we use electicity safely in the home.
plugs
mains electricity cables have two or three inner wires. each wire is colour coded.
in a plug, the blue neutral wire goes to the left, the brown live wire to the right and the green and yellow striped earth wire to the top. the fuse fits next to the live wire.
fuses
the fuse breaks the circuit if a fault in an appliance causes too much current to flow. this protects the wiring and the appliance if something goes wrong. the fuse contains a piece of wire that melts easily. if the current going through the fuse is too great, the wire heats up until it melts and breaks the circuit.
circuit breakers act as resettable fuses. these are automatically operated electrical switches that protect electrical circuits from overloading or short circuiting. they detect faults and then stop the flow of electricity.
circuit breakers
earthing
electical appliances often have metal cases
you would get an electric shock if the live wire inside an appliance came loose and touched the metal casing.
however, the earth terminal is connected to the metal casing so that the current goes through the earth wire instead of causing an electric shock. a strong current surges through the earth wire because it has a very low resistance. this breaks the fuse.
some appliances do not have an earth wire. this is because they have plastic casings.
the casing cannot give an electric shock, even if the wires inside become loose. these appliances have double insulation.
how we use electricity safely in the home
alex bonsall
Created on April 11, 2022
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Transcript
how we use electicity safely in the home.
plugs
mains electricity cables have two or three inner wires. each wire is colour coded.
in a plug, the blue neutral wire goes to the left, the brown live wire to the right and the green and yellow striped earth wire to the top. the fuse fits next to the live wire.
fuses
the fuse breaks the circuit if a fault in an appliance causes too much current to flow. this protects the wiring and the appliance if something goes wrong. the fuse contains a piece of wire that melts easily. if the current going through the fuse is too great, the wire heats up until it melts and breaks the circuit.
circuit breakers act as resettable fuses. these are automatically operated electrical switches that protect electrical circuits from overloading or short circuiting. they detect faults and then stop the flow of electricity.
circuit breakers
earthing
electical appliances often have metal cases
you would get an electric shock if the live wire inside an appliance came loose and touched the metal casing. however, the earth terminal is connected to the metal casing so that the current goes through the earth wire instead of causing an electric shock. a strong current surges through the earth wire because it has a very low resistance. this breaks the fuse.
some appliances do not have an earth wire. this is because they have plastic casings.
the casing cannot give an electric shock, even if the wires inside become loose. these appliances have double insulation.