What is the working principle of the thermistor?

Answer 1

A thermistor changes it's resistance depending on temperature. Hence Thermal-Resistor. (Thermistor)

It is all to do with the crystal structure of the substance the thermistor is made of.

Some increase their resistance as temperature rises, called Positive Thermal coefficient, 'PTC'.

Others reduce their resistance with increasing temperature, called Negative Thermal Coefficient. 'NTC'.

They can be used in a feedback loop of a simple amplifier and switch circuits, to control temperature of a device.

They can be calibrated for use in a current loop, to directly measure temperature, like a thermometer.

They can be used to stop surges in start up circuits, initially giving a high resistance until things warm up. Or used to apply a large current and then reduce as things warm up. (Like in the old degaussing coils on a colour CRT).

Answer 2

thermistors are semiconductor devices that are used to measure temperature. The name comes from a combination of the words "resistor" and "thermal". Thermistors have an electrical resistance that is proportional to temperature. From a general physics course on electricity and magnetism, you may have learned that this is a property typical for all conductors. For example, devices such toasters, heaters, and light bulbs operate on this principle. Thermistors are different in that they are created to deliberately exploit this effect, and hence are more temperature sensitive than usual.

Answer 3

Thermistors are used to realize temperature control. The functions of thermistor are temperature compensation and temperature control. Thermistor is a temperature measuring component.

Thermistor is a resistor made of a special material, and its resistance value changes with temperature. According to the different coefficient of resistance change, thermistors are divided into two types: positive temperature coefficient thermistor (PTC), whose resistance value increases with increasing temperature, and negative temperature coefficient thermistor Resistance (NTC), whose resistance value decreases with increasing temperature.

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Answer 4

To detect heat?