Thermistor is a type of resistor whose resistance changes rapidly with the small change in temperature. In other words, it is a type of resistor in which the flow of electric current changes rapidly with small change in temperature. The word thermistor is derived from the combination of words “thermal” and “resistor”.
Thermistors are classified into two types based on how they behave with the change in temperature:
Negative Temperature Co-efficient (NTC) thermistors
Positive Temperature Co-efficient (PTC) thermistors