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.

Why is it not advisable to use a piece of copper wire as fuse wire in an electric circuit ?

What is the role of fuse, used in series with any electrical appliance? Why should a fuse with defined rating not be replaced by one with a larger rating?

Name the material used for making a fuse wire. Give a reason.

A fuse is rated 8 A. Can it be used with an electrical appliance rated 5 kW, 200 V ? Give a reason.

The earthing of an electric appliance is useful only if the fuse is in the live wire. Give the reason.

Draw an appropriate schematic diagram showing common domestic circuits and discuss the importance of fuse. Why is it that a burnt out fuse should be replaced by another fuse of identical ratting?

Give two reasons why different electrical appliances in a domestic circuit are connected in parallel.

The diagram shows a circuit in which a bulb is connected through connecting the wires to a cell. Name an instrument used to control the electric current in the circuit.

The diagram in Fig. shows the electrical system of a car to operate the two head lights and two rear lights by a switch. shows a connection to the body of the car. The diagram shows only one lead from the battery to each bulb, but a complete circuit must have two leads. How does the current get back to the battery?