Electricity In The Home Flashcards
Describe the size of the current in the live neutral and earth wires when the device is working properly
Earth wire has no current
The neutral and earth wire have the amount of current worked out using I=P/V
Describe the the danger of the live wire came into contact with the metal
If the user touches the metal body they could get electrocuted
How is the earth wire connected to reduce the danger
The earth wire should be connected to the metal frame
How should the fuse be connected
It should be inserted so that it is on the live side of the plug
How do the earth wire and the fuse prevent danger
If there is a fault the current will flow through the low resistance earth wire to earth. This current will be big enough to blow the fuse which will break the circuit
Where should the 3 wires be connected and what colour are they
The earth wire is green and yellow stripes and goes to the top of the plug
The live wire is brown and goes to the right side of the plug
The neutral wire is blue and goes to the left of the plug
What does 240V 80W mean on a tv
It means the tv works normally when connected to a 240V supply
It means in normal operation it uses 80 joules of energy per second
Why do some devices only need 2 wires
The devices are double insulated
Which wire is the switch connected to
Live
How is the user of a double insulated device protected from a electrical shock
All metal parts are enclosed in plastic so no one can come in to contact with the live wire
What is the amount of energy in one kWh
3.6Mj
3 600 600j
What would happen if you used a 3a fuse on a 3kw device
The fuse would blow as soon as you turned on the device as the current is much greater than 3a
What would happen if u used a 13a fuse on a plug for a 60w lamp
The normal current drawn is much less than 13a so the fuse would probably never blow even if current was larger than normal
