Electronics and Communication Engineering - Materials and Components - Discussion

Answer should be: [D]. May be positive or negative depending on its composition.

A thermistor is a type of resistor whose resistance is dependent on temperature, more so than in standard resistors. The word is a portmanteau of thermal and resistor. Thermistors are widely used as inrush current limiter, temperature sensors (Negative Temperature Coefficient or NTC type typically), self-resetting overcurrent protectors, and self-regulating heating elements. (Positive Temperature Coefficient or PTC type typically).

The resistance decreases with increasing temperature, and the device is called a NTC.