Question

Draw a neat diagram of a fuse wire connected in a fuse socket and label it.
ii. State two properties of the material of the fuse wire.
iii. Why is a fuse wire, always placed in a live wire ?​

Answer 1

Answer:

[ii]

1. It is made up of an alloy of lead and tin of high resistance.

2. It is made up of a material of low melting point.

[iii]

The fuse is always connected in the live wire before the appliance, so that as the current in circuit exceeds the rate of fuse, it may melt and break the circuit first, before the current reaches the appliance. Thus no current flows in the appliance.

Answer 2

The correct answer is:

Explanation:

• Fuse wire is used to prevent the excess flow of electric current through a circuit. This way it prevents delicate wires in the electrical appliances from getting damaged due to excess electrical conductivity.

          (i) Properties of fuse wire:

1. Melting point should be low.
2. Conductivity, that is, the capacity to conduct electric current, should be high and resistivity, that is the ability to inhibit the flow of current, should be low.
3. Should be financially affordable.
4. It is an alloy comprising of tin and lead.

          (ii) Fuse wire is always connected to the live wire just before the appliance because the live wire carries the electric current while the earth and the neutral wire carry no current. So, if a short-circuiting occurs causing excess electric current to flow into the live wire, the fuse wire can melt  and prevent the appliance from getting damaged.