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

(N/A) fuse is a safety device used in domestic circuits to protect electrical appliances and wiring from damage due to excessive current flow,which may occur during overloading or short-circuiting.
It works on the heating effect of electric current. When the current exceeds the rated limit,the fuse wire melts due to excessive heat,thereby breaking the circuit and preventing further damage.
$A$ burnt-out fuse must be replaced by another fuse of the same rating because the rating is specifically designed based on the maximum current capacity of the appliances and the wiring in that circuit.
If a fuse of a higher rating is used,it will not melt during an overload,potentially leading to fire or damage to the appliances. If a fuse of a lower rating is used,it will melt frequently even under normal operating conditions.