Question

What are the different types of thermistor ? State their uses.​

Answer 1

Answer :

The thermistors are of two types, having negative temperature coefficient (NTC) and positive temperature coefficient (PTC) of resistivity. This indicates that with the increasing temperature, the resistance of a NTC thermistor decreases. Whereas, the resistance ofna PTC thermistor increases with the increasingntemperature.

Uses : An NTC thermistor is used when a continuous change of resistance is required over a wide temperature range and is extensively used in applications such

• (1) temperature measurement
• (2) temperature control in electrical circuits to prevent overheating
• (3) temperature compensation in mobile communication equipment

A PTC thermistor is used when a large change in resistance is required at a particular temperature or current and is used in applications such as

• (1) a temperature sensor for protection of windings in motors and transformers
• (2) a solid state fuse to protect circuits in the event of drawing too much current as in power supplies
• (3) a liquid level sensor.

Answer 2

There are two types of thermistors: Negative Temperature Coefficient (NTC) and Positive Temperature Coefficient (PTC). With an NTC thermistor, when the temperature increases, resistance decreases. Conversely, when temperature decreases, resistance increases. This type of thermistor is used the most.

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