Resistors and Their Uses

thermistor is a particular type of resistor that blocks an electrical charge. The level of resistance to the electrical charge depends greatly upon the temperature. This is a departure from mainstream resistors. In fact, the word, “thermistor,” is a combination of the words, “thermal,” relating to temperature, and “resistor.” A thermistor is most often used as an inrush current limiter, a temperature sensor, self-resetting overcurrent protector, and a self-regulating heating element.

Thermistors are vastly different from resistance temperature detectors. The kind of material utilized to create a thermistor is a ceramic or or polymer. Resistance temperature detectors, otherwise known as RTD, are usually made of pure metals. A thermistor is also different in the way it responds to temperature: it has a much higher level of precision within a specified range of temperatures. An RTD is used over a much larger range of temperatures.

There are 2 types of thermistors: negative temperature coefficient (NTC) and positive temperature coefficient (PTC). Generally speaking, the NTC sensors are used for measuring temperatures. PTC’s are used in the production of resettable fuses. Increasing the temperature improves the resistance. As the electrical current passes through them, the sensor heats up and blocks the current. This is how they are able to protect the circuits.

Thermistors have proven to be better than other sensors for the following reasons:

A thermistor can be used for a variety of industries including the following:

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