Variable Resistors

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THERMISTOR
Thermistors are resistors that change resistance as the temperature changes. These are ideal in electrical circuits where measuring temperature change is required. There are two types of thermistors:

NTC (Negative Temperature Coefficient)
NTC thermistors: as the temperature goes down, the resistance goes up, and as the temperature goes up, the resistance drops. This type is used today in automotive applications.

PTC (Positive Temperature Coefficient)
PTC thermistors: as the temperature go down, the resistance goes down also, and as the temperature goes up, the resistance increases.

Thermistor
Electrical Symbol