Variable Resistors

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THERMISTOR APPLICATIONS
Thermistors are used as Air, Coolant, EGR, and Automatic Air Temperature sensors. All thermistors have two wires and are used to measure temperature changes. When placed in series with a fixed (pull-up) resistor, thermistors create a variable voltage drop circuit, which is ideal for use by computer circuits. Engine coolant temperature sensor (ECT) is shown below.