what is a thermistor?

Question

how does it work?
is there any practical application of a thermistor?
what are the advantages and disadvantages of using a thermistor?

Answer 1

A thermistor is a type of resistor used to measure temperature changes, relying on the change in its resistance with changing temperature. Thermistor is a combination of the words thermal and resistor.
If we assume that the relationship between resistance and temperature is linear (i.e. we make a first-order approximation), then we can say that:
ΔR = kΔT
where,
ΔR = change in resistance
ΔT = change in temperature
k = first-order temperature coefficient of resistance .

Practical Applications:
PTC thermistors can be used as current-limiting devices for circuit protection, as replacements for fuses. Current through the device causes a small amount of resistive heating. If the current is large enough to generate more heat than the device can lose to its surroundings, the device heats up, causing its resistance to increase, and therefore causing even more heating. This creates a self-reinforcing effect that drives the resistance upwards, reducing the current and voltage available to the device.
NTC thermistors are used as resistance thermometers in low-temperature measurements of the order of 10 K.
NTC thermistors can be used as inrush-current limiting devices in power supply circuits. They present a higher resistance initially which prevents large currents from flowing at turn-on, and then heat up and become much lower resistance to allow higher current flow during normal operation. These thermistors are usually much larger than measuring type thermistors, and are purpose designed for this application.
Thermistors are also commonly used in modern digital thermostats and to monitor the temperature of battery packs while charging.

Advantage:They offer mechanical, thermal and electrical stability, together with a high degree of sensitivity.
For more, please click:http://www.thermometrics.com/htmldocs/whatis.htm

Answer 2

A thermistor is a type of resistor used to measure temperature changes, relying on the change in its resistance with changing temperature. Thermistor is a combination of the words thermal and resistor. The Thermistor was first invented by Samuel Ruben in 1930, and has U.S. Patent #2,021,491.

If we assume that the relationship between resistance and temperature is linear (i.e. we make a first-order approximation), then we can say that:

ΔR = kΔT
where

ΔR = change in resistance
ΔT = change in temperature
k = first-order temperature coefficient of resistance
Thermistors can be classified into two types depending on the sign of k. If k is positive, the resistance increases with increasing temperature, and the device is called a positive temperature coefficient (PTC) thermistor, Posistor. If k is negative, the resistance decreases with increasing temperature, and the device is called a negative temperature coefficient (NTC) thermistor. Resistors that are not thermistors are designed to have the smallest possible k, so that their resistance remains almost constant over a wide temperature range.

Answer 3

An electrical resistor with a relatively large negative temperature coefficient of resistance. Thermistors are useful for measuring temperature and gas flow or wind velocity.
A thermistor can also be called a thermal resistor. It is a semiconductor device made of materials whose resistance varies as a function of temperature. It is used to compensate for temperature variation in other components of an electronic circuit, sometimes taking the place of a fuse with its ability to limit current when overheated by an electrical fault. It is often used as part of temperature control circuitry, among its many other applications.

https://www.electrikals.com

Answer 4

wish this facilitates. Thermistor From Wikipedia, the unfastened encyclopedia bounce to: navigation, seek NTC thermistor, bead sort, insulated wiresA thermistor is a sort of resistor used to degree temperature variations, based on the substitute in its resistance with changing temperature. Thermistor is a portmanteau of the words thermal and resistor. If we anticipate that the relationship between resistance and temperature is linear (i.e. we make a popular-order approximation), then we are able to declare that: ?R = k?T the place ?R = substitute in resistance ?T = substitute in temperature ok = first-order temperature coefficient of resistance Thermistors could be categorized into 2 kinds based on the sign of ok. If ok is effective, the resistance will advance with increasing temperature, and the gadget is talked approximately as a favorable temperature coefficient (%) thermistor, posistor or sensistor. If ok is unfavourable, the resistance decreases with increasing temperature, and the gadget is talked approximately as a unfavourable temperature coefficient (NTC) thermistor. Resistors that are actually not thermistors are designed to have the smallest conceivable ok, so as that their resistance maintains to be very almost consistent over a super temperature variety

Answer 5

What Is Thermistor

Answer 6

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 (NTC type typically), self-resetting overcurrent protectors, and self-regulating heating elements.

Thermistors differ from resistance temperature detectors (RTDs) in that the material used in a thermistor is generally a ceramic or polymer, while RTDs use pure metals. The temperature response is also different; RTDs are useful over larger temperature ranges, while thermistors typically achieve a greater precision within a limited temperature range, typically −90 °C to 130 °C.


https://www.electrikals.com/

Answer 7

Thermistors are thermally sensitive resistors whose prime function is to exhibit a large, predictable and precise change in electrical resistance when subjected to a corresponding change in body temperature. Negative Temperature Coefficient (NTC) thermistors exhibit a decrease in electrical resistance when subjected to an increase in body temperature and Positive Temperature Coefficient (PTC) thermistors exhibit an increase in electrical resistance when subjected to an increase in body temperature. U.S. Sensor produces thermistors capable of operating over the temperature range of -100° to over +600° Fahrenheit. Because of their very predictable characteristics and their excellent long term stability, thermistors are generally accepted to be the most advantageous sensor for many applications including temperature measurement and control.
https://www.electrikals.com/

Answer 8

try this site:
http://www.answers.com/thermistor?gwp=11&ver=2.0.1.458&method=3

be sure to scroll down through the page to see if you can find what you need.

Answer 9

What Is A Thermister