SP10i test 3

Question 1

What are the name of the three wires within a plug and tell me its location.

Answer 1

earth wire - located where the top pin is
live wire - located next to the fuse
neutral wire- located on the bottom left

Question 2

What is the purpose of the earth wire?

Answer 2

It connects the metal parts of the appliance to a large metal spike or metal tubing that is pushed into the ground. its is for safety. it is at 0 V

Question 3

What is the purpose of the Live wire?

Answer 3

It connects the appliance to the generators at the power station. it is at 230 V

Question 4

What is the purpose of the Neutral wire?

Answer 4

It returns the path to the power station. If it connects correctly it should be at 0 V

Question 5

What is a Fuse and how does it work?

Answer 5

a fuse is a tube with a thin wire inside. The current passes through, the wire gets hotter and hotter. If the current exceeds a certain value then the wire melts which breaks the circuit and stops the current

Question 6

State the two advantages a circuit braker has over fuses.

Answer 6

One advantage is that once the fault is fixed they can be switched back on again, whereas a fuse has to be replaced

Another advantage of some types is that they work very quickly, so the can save lives. A fuse takes some time to melt and will not prevent you from getting a shock if for example you touch the live wire