What is a Thermistor?Thermistor DefinitionA thermistor (or thermal resistor) is defined as a resistor whose electrical resistance varies significantly with changes in temperature.Thermistors act as a passive component in a circuit. They are an accurate, cheap, and robust way to measure temperature.Although thermistors aren’t effective in extreme temperatures, they are preferred sensors for many applications.Thermistors are ideal when a precise temperature reading is required. The circuit symbol