General Knowledge - Basic General Knowledge - Discussion
Discussion Forum : Basic General Knowledge - Section 1 (Q.No. 49)
49.
For safety, the fuse wire used in the mains for household supply of electricity must be made of metal having
Discussion:
34 comments Page 2 of 4.
Imtxn said:
9 years ago
The discussion has been about fuse impedances & melting point. Can we discuss factors affecting fuse operating points?
Anmol (MIT professor) said:
9 years ago
Fuse is a low resistance and melting point sacrificial device.
Sobia said:
8 years ago
The piece of wire which melts due to exceed of current is called __________.
Bulb, Rubber, Fuse, circuit.
Answer this.
Bulb, Rubber, Fuse, circuit.
Answer this.
Pankaj said:
8 years ago
Those who are saying fuse wire have high resistance! I would like to ask them if it is so then according to them it must be low conductivity!
But as far as I know fuse wire must have high conductivity. You guys can decided (G=1/R).
But as far as I know fuse wire must have high conductivity. You guys can decided (G=1/R).
Sk Jahedul islam said:
8 years ago
As fuse wire alawys connect series with load.
It's a protective device.
H=I2RT.
From this equation, if we increase the value of heat by increasing ckt current or resistance.
If it's low resistance, that means we going to allow high current and it's damage our device.
So better if it's high resistance then the value of H increase and it's melt and protects the device.
Fuse material should low melting point , high resistance and high specific resistance(as length and cross-section of fuse material constant)
It's a protective device.
H=I2RT.
From this equation, if we increase the value of heat by increasing ckt current or resistance.
If it's low resistance, that means we going to allow high current and it's damage our device.
So better if it's high resistance then the value of H increase and it's melt and protects the device.
Fuse material should low melting point , high resistance and high specific resistance(as length and cross-section of fuse material constant)
Vigesh said:
7 years ago
The melting point of the fuse material should be low because the material should act faster to ihe increase in temperature so as to break the circuit (open circuit).
Ketan said:
7 years ago
What is short circuit? Please explain briefly in technical.
Malli said:
1 decade ago
Because the wire has to melt when sudden variation in the current/voltage, otherwise it may damage electric instruments inside the house. By melting it avoid a damage to the other instruments hence need to have low melting point fuse wire.
Nivedha said:
1 decade ago
Oh yep. But I thought high resistance. Is it correct?
Justin C Das said:
1 decade ago
The fuse wire is used on the basis on the Joules law of heating.
The law says that when the electric current is allowed to pass trough a conductor, the conductor heats up and is proportional to the square of current.This is because practical conductors have definite resistance(normally it is small).
The heat produced= Isq*R*T
The main object of using fuse wire in electric circuit is to provide protection against short circuit or overload current. This means it protects the circuit from huge amount of current flow as it cause the damage to the circuit.
The fuse wire select such a way that it burns and break the circuit when large current passes. For this purpose the material used as fuse wire should have high resistance and low melting point.Due to high resistance the wire heats up quickly, when huge current flows. The temperature around the fuse wire rapidly rises, when it reaches the melting point of the material it burns and protects the circuits.
High resistance and low melting point are responsible to the quick response of the fuse wire towards the current.
The common material used as fuse wire is an alloy of tin and lead.
The law says that when the electric current is allowed to pass trough a conductor, the conductor heats up and is proportional to the square of current.This is because practical conductors have definite resistance(normally it is small).
The heat produced= Isq*R*T
The main object of using fuse wire in electric circuit is to provide protection against short circuit or overload current. This means it protects the circuit from huge amount of current flow as it cause the damage to the circuit.
The fuse wire select such a way that it burns and break the circuit when large current passes. For this purpose the material used as fuse wire should have high resistance and low melting point.Due to high resistance the wire heats up quickly, when huge current flows. The temperature around the fuse wire rapidly rises, when it reaches the melting point of the material it burns and protects the circuits.
High resistance and low melting point are responsible to the quick response of the fuse wire towards the current.
The common material used as fuse wire is an alloy of tin and lead.
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