Mains Electricity

Question 0

Alternating current

Answer 0

Current repeatedly reverses it’s direction

Question 1

Direct current

Answer 1

Current in one direction only

Question 2

What are plugs and sockets made of

Answer 2

Thermosetting plastic because they are good electrical insulators

Question 3

Why are the pins on a plug made of brass

Answer 3

Brass is a good conductor of electricity

It will not rust or oxidise

Question 4

What is the earth wire connected to

Answer 4

Longest pin at the top

Question 5

What does the earth wire look like

Answer 5

Green and yellow striped

Question 6

What is the blue wire and what is it connected to

Answer 6

Neutral wire connected to the neutral pin

Question 7

What is the brown wire and what is it connected to

Answer 7

Live wire connected to the live pin

Question 8

Appliances with metal cases must be earthed why

Answer 8

Because it’s not double insulated

Question 9

Fuse

Answer 9

Cuts the appliance off from the live wire if the fuse blows

Question 10

What can electrical faults cause

Answer 10

Electrical shocks and fires

Question 11

Why are filament bulbs very inefficient

Answer 11

They don’t last very long