What are the reasons for melting of a fuse wire?
Answer. Answer: A fuse is used in a circuit to avoid overloading or short circuiting. When a current higher than the rating of the fuse flows through it, the fuse wire gets heated and melts.
Why should a material of low melting point be used as a fuse wire?
The material used for a fuse wire must have a low melting point so that it melts as soon as excessive current passes through it and thus it can prevent the appliance from damage.
Why the material used for fuse has low melting point?
(1) The melting point of the material used for fuses is low because if the current exceeds the limiting value then the temperature of wire increases and the fuse wire melts and breaks down at that very moment. So, the current stops. This prevents damaging the costly electrical appliances connected through the circuit.
Which material is used for fuse has low melting point?
The use of fuse safeguards the circuit and appliances connected in that circuit from being damaged. An alloy of lead and tin is used as a material of fuse because it has low melting point and high resistivity.
Why is the fuse wire fitted in a porcelain casing?
Complete answer: The fuse wire is fitted in porcelain casing because porcelain may be an insulator of electricity. Porcelain may be an excellent insulator and therefore if the part of the holder we touch is away from the eager beaver then there’s no damage from getting any electric shock.
How does the thickness and length of a fuse wire depends on its current rating?
(i) Is directly proportional to the thickness of the fuse wire. Thicker the fuse wire, higher will be the current rating of the fuse wire. (ii) The current rating of the fuse wire does not depend on its length.
Does the function of fuse wire depends on its length?
Hence, the length of the fuse wire is does not matter.
Why is switch put in the live wire?
The switch must be placed in live wire to maintain the body of appliance at zero potential in the switch off position and if the switch is kept in neutral wire, then the body of the appliance to keep the body at infinite potential in the switch on position.
What is meant by the statement that the rating of fuse in a circuit is 5 ampere?
If an excess current passes through the electrical appliance, it gets damaged. Current rating of fuse as 5 A means that a maximum current of 5 A can be passed through it without damaging it. If a current greater than 5 A is passed through the fuse, it will melt.
Which type of fuse is used in houses?
Rewirable or Kit – Kat Type Fuses are a type of Low Voltage (LV) Fuses. They are most commonly used in house wiring, small industries and other small current applications. Rewirable Fuses consists of two main parts: a Fuse Base, which contains the in and out terminal, and a Fuse Carrier, which holds the Fuse Element.
When a fuse is rated 15a it means?
For example, a 15-ampere fuse should trip when the current through it exceeds 15 amperes.
What is the function of a closed switch?
A closed switch is one that provides a direct (low resistance) path for current to flow through.