Appliances must be Earthed or Insulated

Question 1

What are the three live wires in a plug?

Answer 1

Live, neutral and earth

Question 2

Which two wires are only usually needed?

Answer 2

Live and neutral

Question 3

What does the live wire alternate between?

Answer 3

A high +ve and -ve voltage of about 230 V

Question 4

The neutral wire is always at?

Answer 4

0 V

Question 5

Electricity normally flows through?

Answer 5

The live wire and the neutral wire

Question 6

What is the earth wire and fuse for?

Answer 6

Safety and work together

Question 7

What must all appliances with metal cases have to be and why?

Answer 7

‘Earthed’ to reduce the danger of electric shock

Question 8

What does ‘earthing’ mean?

Answer 8

The case must be attached to an earth wire

Question 9

What can an earthed conductor never become?

Answer 9

Live

Question 10

What does it mean for an appliance to be double insulated?

Answer 10

Has a plastic casing and no metal parts showing

Question 11

What does anything with double insulation not need?

Answer 11

Doesn’t need an earth wire - just a live and neutral as the plastic is an insulator