Electronics - Diodes and Applications - Discussion

Varistor is the voltage dependent resister i.e. it depends on the value of voltage.

A varistor is an electronic component with a "diode-like" nonlinear current-voltage characteristic. The name is a portmanteau of variable resistor. Varistors are often used to protect circuits against excessive transient voltages by incorporating them into the circuit in such a way that, when triggered, they will shunt the current created by the high voltage away from sensitive components. A varistor is also known as Voltage Dependent Resistor or VDR. A varistor's function is to conduct significantly increased current when voltage is excessive.

Varistor is a special type resistor it depend upon the voltage varistor also called as voltage depending resistor.

I have a small doubt. High barrier potential is provided when the temperature is increased in reverse bias. Then it offers high resistance. When the temperature is increased in forward bias, in that situation there is small barrier potential. Then current is high and resistance is small.

When voltage drop increases across the resistor, power dissipation also increase because of P=VI and thus temperature increases.

Due to increase in temperature there are a lot of free electrons generates in the wire which moves randomly in all direction and provide barrier in the path of current & hence the resistance of wire increase.

Varistor is the special type of resistor, its changes the resistance un accordance with the temperature.

This is a resistor whose value changes with the applied voltage. We can get this type of resistors from FETs.

This is a kind of resistor whos values changes in accordance with the change in applied voltage.

This is a kind of resistor whos values changes in accordance with the change in applied voltage.

A varistor is a resistor which changes resistance in accordance with the temperature.