Mains Electricity (plugs & fuses) Flashcards
(14 cards)
How does the use of insulation protect domestic appliances?
An electric insulator stop the current of electricity before it reaches the ground, rubber is probably the most commonly used insulator
How does the use of double insulation protect domestic appliances?
This is where the entire wire is covered in plastic with no metal showing, if you touch it, you can’t get an electric shock. If it has double insulating, it will not need an earth wire it will only need a live wire and a neutral wire.
How does the use of earthing protect domestic appliances?
Earthing is where an earth wide provides an alternative way, so the electricity goes through the wire and not us.
How does the use of fuses/circuit breaker protect domestic appliances?
it breaks the circuit whenever the current gets too high. It is a very thin piece of wire when surges come diffuse heats up really quickly and melts this then stop the circuit.
What’s the structure of a two core cable?
- neutral wire
- live wire
What’s the structure of a three core cable?
- neutral wire
- live wire
- earth wire
What materials are used in three pin plugs?
Copper wires
Why are these materials used in three pin plugs?
Copper is used because it is a good conductor of electricity
What is the colour coding of the covering of the three wires used in three pin plugs?
Earth wire = green/yellow
Neutral wire = blue
Live wire = brown
What is the purpose and action of the fuse wire?
A fuse is a safety device that uses the heating effect of electricity When the current
gets too high, the fuse melts and breaks the circuit.
What is the purpose of action of the earth wire?
All appliances with metal cases must be earthed to reduce the danger of electric shock.
How do RCCBs Operate?
By detecting a difference in the current between the live and neutral wires.
What operates faster an RCCB or a fuse?
RCCB
What does an RCCB stand for?
Residual Current Circuit Breaker
