Electrical Safety

Question 1

what may metals need in order for them to not give us an electric shock

Answer 1

1) Earthing

2) Insulating

Question 2

what is an earth wire

Answer 2

an earth wire is a low resistance wire that connect the metal case to the ground

Question 3

explain the use of an earth wire

Answer 3

1) if the casing is touched by the wire inside an appliance the current will flow through the earth wire
2) because the resistance of the earth wire is low, a high current will run through it breaking the fuse in the device

Question 4

what happens when the fuse in a device is broken

Answer 4

when the fuse in a device is broken the flow of the current will stop making the appliance safe

Question 5

why is plastic used as a safety material

Answer 5

1) plastic is an insulator, so it acts as an extra layer of insulation this makes the appliance double insulated

Question 6

when doesn’t an appliance need an earth wire

Answer 6

when it is double insulated