Question

Explain, why fuse wire is made of

a tin-lead alloy and not copper?

(b) A domestic circuit has 5A fuse.

How many bulbs of rating 100W,

220V can be safely used in this circuit?

Justify your answer. ​

Answer 1

1)the tin and lead have low melting point that of the copper has greater than them

2)a fuse wire is used to protect a circuit and the appliances connected in the circuit by stopping the flow of an excessive electric current,for this the fuse wire must melt

3)for melting the melting point must be low

4) copper has greater melting point than that of tin and lead

5) hence,fuse wire made-up of tin and lead than that of copper

Answer 2

Tin and lead have very low melting point which helps the fuse to burn during large passage of current allowing less current to flow.

Fuse are not made of copper as it has high melting point and for making fuse we need metal having low melting point.

b) A domestic circuit has 5A fuse because appliances used are of low power rating and consumes less energy due to which there are less chances of overloading or short circuiting so domestic circuit has 5A fuse.

10 bulbs as the 5A fuse is used for 1kwt rating.