Describe with the aid of a diagram some form of a fuse, which is used in the electric lighting circuit of a house. Give two reasons why a fuse must not be replaced by an ordinary copper wire.

(a) What is the purpose of a switch in a circuit?

(b) Why is the switch put in the live wire?

(c) What precaution do you take while handling a switch?

Draw a circuit diagram using the dual control switches to light a staircase electric light and explain it's working.

What purpose is served by the terminals of a three way pin plug? Draw a diagram and name the pins.