An input sensor
The thermistor is designed to measure temperature. It works because its electrical resistance changes with temperature. So if you put a current through the thermistor, a voltage will be produced that depends on its temperature.
Thermistors are often used in electronic equipment to measure the temperature of a component. For example, an audio power amplifier may have thermistors attached to the power transistors. If they get too hot, then they are turned down to cool off a bit.
See also Thermocouple which also measures temperature.
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Click on this link: Thermistor