What is the function of a thermistor in electronics?

A thermistor is a type of resistor whose resistance varies significantly with temperature. Its primary function is to act as a temperature sensor, making it crucial in various applications where temperature measurement or control is necessary. By analyzing changes in resistance due to temperature fluctuations, thermistors can provide accurate readings that are vital in systems such as thermometers, thermostats, and temperature monitoring devices.

As the temperature increases, the resistance of a thermistor decreases (for a negative temperature coefficient thermistor) or increases (for a positive temperature coefficient thermistor). This property allows thermistors to effectively translate temperature changes into measurable electrical variations, enabling electronic systems to monitor and adjust based on the thermal environment.

The other options relate to distinct functions in electronics that do not align with the specific role of thermistors. For instance, controlling power supply voltage, regulating current flow, and enhancing signal strength involve different components and mechanisms, such as voltage regulators, current limiting devices, and amplifiers, respectively. Each of these functions serves specific purposes that are separate from sensing temperature.