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 4 of 4.
Bharath said:
1 decade ago
A fuse wire should always have a high resistance and low melting point.
High resistance to heat up soon and low melying point to melt away due to the heat produced by high resistance so that the circuit is not damaged.
High resistance to heat up soon and low melying point to melt away due to the heat produced by high resistance so that the circuit is not damaged.
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.
Nivedha said:
1 decade ago
Oh yep. But I thought high resistance. Is it correct?
Vishal devgan said:
1 decade ago
The melting point of a solid is the temperature at which the vapor pressure of the solid and the liquid are equal. At the melting point the solid and liquid phase exist in equilibrium. When considered as the temperature of the reverse change from liquid to solid, it is referred to as the freezing point or crystallization point. Because of the ability of some substances to supercool, the freezing point is not considered to be a characteristic property of a substance. When the "characteristic freezing point" of a substance is determined, in fact the actual methodology is almost always "the principle of observing the disappearance rather than the formation of ice", that is, the melting point.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers