by 
kevinj
ANSWERS: 4
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It is a device that breaks a circuit when the circuit has too high of an amperage.
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Protection from excessive current.
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A fuse is a deliberate 'weak link' in the electrical distribution system. In the event of a fault occurring, e.g. a short circuit, very high currents will flow which if left uninterrupted would damage the distribution system, possibly causing fire and injury. The fuse is designed to blow and interrupt this fault current safely before serious damage can occur. Also, when the fault has been fixed, replacing a fuse is more convenient than hunting down a burnt-out cable.
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A copper wire is used as fuse, but you have to take care that the wire is thin(means wire of less cross section area). We know that resistance R is inversely propotional to cross section of resistor. Thinner wire will have less cross sectional area, so the resistance R will be more. H=i^2Rt (read i^2 = square of the i), i=current, R=resistance, t= time, H=amount of heat generated by any resistance when current i is passed thrugh it, for a time period t. For any reason if the current i increases, heat generated will be more & temperature of the resistance will go beyond the melting point of fuse,which will melt it, thus stopping the electricity of your premises, saving cables,appliances,home from fire.
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