Using Mains Electricity Safely And The Power Of Electrical Appliances

Question 1

What is the power of an electrical appliance determined by

Answer 1

Rate at which it transforms energy

Question 2

What is a circuit breaker

Answer 2

Electromagnetic switch that opens (switch off or trips) when there is a fault.
Stops current in live wire
If current in live wire is too high, the magnetic field of the electromagnetic is strong enough to pull the switch contacts apart.
Once switch open, it stays open
It can be reset and be fault is fixed

Question 3

Why is an rrcb

Answer 3

Works faster than circuit breaker
Cuts off current in live wire when it is different from neutral wire
Can be used where there is no earth connection
More sensitive than fuse and circuit breaker

Question 4

What colour is the..
Neutral wire
Earth wire
Live wire

Answer 4

Blue
Yellow and green
Brown