Why are fuse wires used in the electrical circuits at home? Why are they not used in a circuit containing electric cells?

A fuse is a small conducting wire of low melting point which protects the household electrical system from getting damaged due to unusual high current.

The unusual high current may be due to short circuit, power fluctuation in the electric line etc. The fuse wire is made of conducting alloy or metals of low melting point. Thin wires of metals such as: tin, aluminium, copper and thin wires of alloys of bronze, brass, nichrome are used as fuse.

There is no voltage fluctuation in circuit containing electric cells because value of emf of cell is fixed. 

And in this circuits we deals with small value of current. 

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 fuse (from the French fuser, Italian fuso, "spindle"[1]) is a type of low resistance resistor that acts as a sacrificial device to provide overcurrent protection, of either the load or source circuit. Its essential component is a metal wire or strip that melts when too much current flows, which interrupts the circuit in which it is connected. Short circuit, overloading, mismatched loads or device failure are the prime reasons for excessive current.

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 Because when the large amount of electricity come to the home the wire of fuse is melted and prevent the electrical appliances from fuse so fuse wires are not used in a circuit containing electric cells.


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