Question

What is the function of a fuse with respect
of value of current in a circuit?​

Answer 1

Answer:

The function of the fuse is to carry normal current without interruption and during an over current situation it rapidly heats up to melting point and isolates the circuit protected by it. For the satisfactory performance of the fuse, the following desired characters of the fuse element is necessary.

                     Electric fuse types :

1. In 1847 French physicist and watch maker Louis François Clément Breguet recommended a reduced strip conductor to protect telegraph station from lightning strikes. He thought by melting smaller wires would protect the apparatus and wiring inside the building.
2. By 1864 a variety of wires and foil fusible apparatus were used for the purpose of protection of telegraph cables and lighting systems. In 1890 Thomas Alva Edison patented a fuse as a part of his electrical distribution system. Electrical fuses are sacrificial elements in an electrical circuit which protect the system from over current.
3. Fuses are designated to open circuit during an occurrence of excessive current due to the presence of an overload or fault and prevent the further damage of the system.
4. Various components of a fuse are: melt fuse element, set of contacts and supporting body. Fuse element are generally made of materials with low melting point, high conductivity and less deterioration due to oxidation. They are inserted in series with the circuit to be protected.
5. Under normal operating conditions the fuse element in kept at a temperature below its melting point so that it carries normal current without overheating.
6. During the occurrence of short circuit or overload, the current in the fuse element increases beyond the rated value.
7. This raises the temperature leading to melting of fuse element thus disconnecting the circuit protected by it.  
8. The magnitude of the over current decides the time required for the blow out of the fuse.
9. Greater the current, smaller the time required for the fuse to blow out or it can be said that fuse has an inverse time-current characteristics.

Explanation:

Answer 2

Answer: Fuse is used as a circuit breaker in a circuit. It is used to break the circuit when overflow of current passes through it . There is a thin wire present inside the fuse which breaks the circuit when overflow of current passes through it, thus it saves our electrical appliances from getting damaged.

Explanation:

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