How does a thermistor function within a circuit?

A thermistor operates based on its intrinsic property of changing resistance in response to temperature variations. Specifically, it is a type of temperature-sensitive resistor, where the resistance decreases as the temperature increases (in the case of a negative temperature coefficient thermistor) or increases as temperature rises (for a positive temperature coefficient thermistor).

This characteristic allows the thermistor to effectively sense temperature changes within a circuit. By incorporating a thermistor into a circuit, it can be used to provide temperature feedback, enabling the circuit to adjust its behavior based on current thermal conditions. For example, in a temperature monitoring system, the resistance change in the thermistor can be translated into voltage readings that reflect the surrounding temperature, thus facilitating accurate temperature measurement.

Understanding this principle is crucial for applying thermistors in various electronics, such as in thermostats, temperature sensors, and other devices where temperature regulation is needed.