Explain the working of an electric fuse

Dear student

An electrical fuse is a safety device and it works on the heating effect of current.The fuse for protecting our domestic wiring is fitted just above our main switch on the switchboard.It is connected in series in series in the electric circuits.The fuse are rated with defined rating it should not be replaced by the fuse with larger rating.You can understand it by an example: the fuse in the lighting and fan circuit of a small house is of 5 amperes rating, it means that the fuse wire will melt if the current exceeds 5 A value.The fuse with some defined rating has some definite function so it can't be replaced by one with larger rating.This is connected in series in the circuits.If the fuse wire breaks due to short circuit or overloading ,electricity supply is automatically switched off before any damage But when fuses are connected in parallel, one must take into account that the current sharing is not necessarily equal.and it must be checked, that the maximum load current is not exceeded.

With regards