Of what substance is the fuse wire made? Why?

How should the electric lamps in a building be connected so that the switching on or off in a room has no effect on other lamps in the same building?

Fill in the following blanks with suitable words:

(a) A fuse should always be placed in the .............wire of a mains circuit.

(b) The earth wire should be connected to the..............of an appliance.

Explain why, a copper wire cannot be used as a fuse wire.

What type of electric fuse is used in electrical appliances like car stereos? Explain with the help of a labelled diagram.