Electronics - Diodes and Applications - Discussion

1. 

What is a varistor?

[A]. a voltage-dependent resistor
[B]. a voltage-dependent diode
[C]. a current-dependent resistor
[D]. a current-dependent diode

Answer: Option A

Explanation:

No answer description available for this question.

Komal said: (Oct 15, 2010)  
A varistor is a resistor that depends or varies in accordance with voltage.

Rajendar said: (Jun 11, 2011)  
I want rest of components details also. Anyone.

Neelaji said: (Aug 29, 2011)  
A varistor is a resistor which changes resistance in accordance with the temperature.

Swapnil said: (Dec 9, 2011)  
This is a kind of resistor whos values changes in accordance with the change in applied voltage.

Kuldeep said: (Feb 6, 2012)  
This is a kind of resistor whos values changes in accordance with the change in applied voltage.

Satya said: (Apr 13, 2012)  
This is a resistor whose value changes with the applied voltage. We can get this type of resistors from FETs.

Kishan Tj said: (Apr 20, 2012)  
Varistor is the special type of resistor, its changes the resistance un accordance with the temperature.

Deepak Jha said: (Jul 29, 2012)  
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.

Saranya said: (Jul 30, 2012)  
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.

Vasanthi.M said: (Sep 14, 2012)  
Varistor is a special type resistor it depend upon the voltage varistor also called as voltage depending resistor.

Neeraj said: (Jan 2, 2013)  
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.

Neelesh Rajak said: (Mar 12, 2013)  
Varistor is the voltage dependent resister i.e. it depends on the value of voltage.

Ram said: (Jul 4, 2014)  
A semiconductor diode with resistance dependent on the applied voltage.

Donald said: (Jul 18, 2014)  
If referred as a semiconductor diode or a voltage dependent resistor, does it sound correct? I doubt.

Bharath Kumar.S.P said: (Feb 21, 2015)  
The forward and reverse biased states of a diode can be compared to a variable resistor. A forward biased diode will drop only .3 or .7 V.

That corresponds to an internal resistance in the anode that drops from several Kilo-ohms at the point where conduction begins to several ohms where a diode is conducting heavily.

In the reverse bias state, resistance will be in the Mega-ohms until breakdown voltage is reached.

Jayasankar said: (Jan 27, 2016)  
Varistor is an electronic component with an electrical resistance that varies with the applied voltage. It is also known as a Voltage Dependent Resistor (VDR).

Sekhar said: (Dec 29, 2016)  
Var = variable, istor = resistor.

Ramesh said: (Jul 11, 2018)  
What is the use of semiconductor devices?

Jeen said: (Sep 3, 2019)  
What is varistor? Someone explain.

Manoj said: (Oct 15, 2019)  
If some can explain the advantages of IGBT ovr ovt.

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