Question

Thermistors have ________

• A. positive temperature coefficient
• B. negative temperature coefficient
• C. zero temperature coefficien
• D. infinite temperature coefficient

Answer 1

The correct option is B negative temperature coefficient

1. Thermistor is a resistance thermometer, or a resistor whose resistance is dependent on temperature. The term is a combination of “thermal” and “resistor”. It is made of metallic oxides, pressed into a bead, disk, or cylindrical shape and then encapsulated with an impermeable material such as epoxy or glass.
2. It should be known to us that thermistors are used as temperature sensors. They can be found in everyday appliances such as fire alarms, ovens and refrigerators. They are also used in digital thermometers and in many automotive applications to measure temperature.
3. Thermistor generally has a negative temperature coefficient of resistance. With increase in temperature, resistance of a thermistor decrease​.a