General Knowledge - Basic General Knowledge - Discussion

Fuse wire is a wire of high resistance and low melting point.

What is short circuit? Please explain briefly in technical.

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).

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)

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).

The piece of wire which melts due to exceed of current is called __________.

Bulb, Rubber, Fuse, circuit.

Answer this.

Fuse is a low resistance and melting point sacrificial device.

The discussion has been about fuse impedances & melting point. Can we discuss factors affecting fuse operating points?

Fuse is connected in series with load so we consider current passing though it.

Example. A 50 ohm resistance is connected accros a 100 volt supply, then heat will be is 200 joule in 1 sec. Now the resistance of 20 ohm is connected of same material accros the supply. Now heat will be 500 joule in 1 sec.