GDS Voltage divider sensor Transistor switch and a motor DC Motor load thermistor R%3D50KQ-30KO D. G. (+ 10V3VS +. fixed resistor R=12k2 Vin oV Fig. 2b. An actuator circuit with a sensor (voltage divider), a switch (power transistor), and a DC motor. Earth ground maybe desired but is not required. Note that the fixed resistor value has changed compared to the circuit in Fig. 1. ceeds 23volto and oven AY (+)]

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Thermistors

A thermistor is a special type of resistor whose resistance is more temperature-dependent than standard resistors.  The resistance of the thermistor decreases with increasing temperature. This is the basic principle of thermistors. This allows the thermistor circuit to detect very small temperature changes that cannot be observed with the Resistance temperature detectors (RTDs) or the thermocouples. Since the resistance of a thermistor is temperature dependent, it can be connected to an electrical circuit to measure body temperature. This high sensitivity to temperature changes makes thermistors very useful for accurately controlling and calibrating temperature measurements. In general, resistance increases with increasing temperature in most metals, but thermistors react negatively.