Question

how does fuse make circuit

Answer 1

Answer:-

Fuses don't protect an electric current apart from this fuse protects electrical circuit and electrical equipment or accessories.

Their application is now not existed in this modern era. To protect the circuitry accessories an MCB is wide used.

Description: A fuse is nothing more than a short length of wire designed to melt and separate in the event of flowing excessively current. Fuses are always connected in series with the component to be protected from overcurrent, so that when the fuse blows (opens) it will open the entire circuit and stop current through the components. A fuse connected in one branch of a pparallel circuit , that would not affect current through any of the other branches. This is the parallel operating point of a fuse and wouldn't be affected from another circuit.

The circumstances behind blown up a fused wire is that when a low melting point electrode carries a high current it will burn and hence opens the circuit.

The thin piece of fuse wire is contained within a safety sheath to minimize hazards of arc blast if the wire burns open with violent force, as can happen in the case of severe overcurrents. In the case of small automotive fuses, the sheath is transparent so that the fusible element can be visually inspected. Residential wiring used to commonly employ screw-in fuses with glass bodies and a thin, narrow metal foil strip in the middle.

Fuses are primarily rated, as one might expect, in the unit for current: amps. Although their operation depends on the self-generation of heat under conditions of excessive current by means of the fuse’s own eelectrical resistance. They are engineered to contribute a negligible amount of extra resistance to the circuits they protect. This is largely accomplished by making the fuse wire as short as is practically possible. Just as a normal wire’s ampacity is not related to its length (10-gauge solid copper wire will handle 40 amps of current in free air, regardless of how long or short of a piece it is), a fuse wire of certain material and gauge will blow at a certain current no matter how long it is. Since length is not a factor in current rating, the shorter it can be made, the less resistance it will have end-to-end.