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A thermistor changes it's resistance depending on temperature. Hence Thermal-Resistor. (Thermistor)
It is all to do with the crystal structure of the substance the thermistor is made of.
Some increase their resistance as temperature rises, called Positive Thermal coefficient, 'PTC'.
Others reduce their resistance with increasing temperature, called Negative Thermal Coefficient. 'NTC'.
They can be used in a feedback loop of a simple amplifier and switch circuits, to control temperature of a device.
They can be calibrated for use in a current loop, to directly measure temperature, like a thermometer.
They can be used to stop surges in start up circuits, initially giving a high resistance until things warm up. Or used to apply a large current and then reduce as things warm up. (Like in the old degaussing coils on a colour CRT).
What else can I help you with?
Why are thermistors used?
thermistors change value as thermal units increases or decreases . that can be used to shut down items that unnecessarily overheat
How are thermistors used in computer fans?
Thermistors change their properties with temperature, so they can be used to run a fan only when it's hot.
How do thermistors work in clothes dryers?
Thermistors in clothes dryers work by sensing the temperature inside the dryer drum. They change their electrical resistance with temperature variations, which is then used by the dryer's control system to regulate the heating element. This helps maintain a consistent temperature during the drying cycle.
Is Thermistor ohmic or non-ohmic?
no.....thermistors are not ohmic.
What is principle of thermistor?
The thermistors are resistors whose resistance changes with the temperature. While for most of the metals the resistance increases with temperature, the thermistors respond negatively to the temperature and their resistance decreases with the increase in temperature. Since the resistance of thermistors is dependent on the temperature, they can be connected in the electrical circuit to measure the temperature of the body.
What material is used in making thermistors?
Thermistors are typically made from metal oxides such as manganese, nickel, cobalt, or iron. These metal oxides are mixed with a ceramic binder and then sintered to form a compact thermistor element.
How does an digital thermometre work?
A digital thermometer has a digital controller called a microcontroller inside of it that measure the thermistors teperature by measuring its electric resistance. Then it displays it on a little LCD screen.
What are the characteristics of a thermistor?
Thermistors are semiconducting devices whose electrical resistance is sensitive to the temperature (which is derived from the two words thermal and resistor). The resistance of a thermistor decreases approximately exponentially with the increasing of temperature. Therefore it is possible to determine the temperature by measuring the resistance across the thermistor. Thermistors are used in various fields such as self regulating heating elements, current limiters and temperature sensors etc.The thermistors are also very robust. And they could not be confused with RTDs (resistance temperature detectors), as the prior is made of semiconductors and the latter from pure metals. Also where RTDs are effective in a massive temperature range where thermistors work in a limited temperature range such as 180 K to 400 K, but with a higher precision.
What has the author James K Luers written?
James K Luers has written: 'Test and development of inflatable spheres instrumented with miniaturized thermistors, accelerometers and pressure transducers' -- subject(s): Balloons, Thermistors, Accelerometers, Transducers
What does a thermistor do that makes it different from a thermocouple?
a thermistor is a temperature sensitive resistor - to measure temperature you must measure its resistance and convert that resistance to equivalent temperaturea thermocouple is a temperature sensitive voltage source(i.e. battery) - to measure temperature you must measure the voltage across it and a reference thermocouple at a known constant temperature connected in series with it and convert that voltage to equivalent temperatureNote: Thermistors do not require reference thermistors, thermocouples do require reference thermocouples at a known constant temperature. Thermocouples are more linear than thermistors, making them easier to read accurately. Thermocouples are available that are far more sensitive to small changes in temperature than thermistors.
What is the value of band gap for thermistor?
NTC thermistors are metal oxide which has energap gap of the oder 0.5eV
Is a thermistor direct current?
That depends on the type of thermistor Some solid state thermistors are only able to run on one correct polarity and so are direct current. Other thermistors designed as simple heat variable resistors can run on both direct current and alternating current.
