When a fuse wire is included in a house hold wiring . What are the precautions to be taken ?

You are working as a volunteer in an AIDS awareness programme. If a person comes to you and asks the following questions, how will you answer? What are the precautions to be taken to prevent AIDS?

When a wire is stretched with a very large force it breaks. Represent the variation of extension with load on a graph.

What are the characteristics of a fuse wire?

When the fuse wire melts , the circuit is broken. What happens to the current in the circuit ?