Thermistors, Physics

Assignment Help:

Thermistors

Insulators and semi-conductors behave in a different way when the temperature increases, because their resistivity decreases. That is: the resistance of an insulator and of a semi-conductor decreases with temperature increase, (their resistance-temperature coefficient is negative!). This feature can be used to advantage as the following example shows.

One example of this effect occurs in a thermistor, which is a thermally sensitive resistor whose resistance alters with temperature; a negative temperature coefficient (n.t.c.) thermistor is one whose resistance reduces with increase in temperature. A thermistor is used in the cooling-water temperature-measuring circuit of a car or lorry; it is inserted in the cooling water and connected in series with the battery and temperature gauge. As the water temperature rises, the resistance of the n.t.c. thermistor falls and allows more current to flow through the temperature gauge; this causes the gauge to indicate variations in water temperature.


Related Discussions:- Thermistors

Determine the angle of incidence, A ray of light XY strikes a surface of a ...

A ray of light XY strikes a surface of a mirror ABCD at point P. a)  Determine the path of the incident ray X-Y-P and the reflected ray P-Z and show this path in all views. (Hin

Single pv cell design., give the complete explaination with design formulae...

give the complete explaination with design formulae of single pv cell?

State faradays laws of electromagnetic induction, Q State Faraday's laws of...

Q State Faraday's laws of electromagnetic induction. First law At any time the amount of magnetic flux linked with a closed circuit changes an emf is induced in the circu

Engineering materials and engineering materials properties, Engineers and t...

Engineers and technologist engage themselves in the design and manufacturing of machine like latches, engines, motors, generators, bulldozers etc. And in the fabrication of vehicle

Explain functions of the commutator, Functions of the commutator:  A co...

Functions of the commutator:  A commutator is a device, which under certain conditions changes ac into dc and vice versa. The commutator is a form of rotating switch placed

Describe the construction of optical fiber, Describe the construction of op...

Describe the construction of optical fiber. Explain the principle of propagation of light waves within a fiber. Define acceptance angle and acceptance.  How optical fibers can be u

What is the unit of capacitance in si system of measure, In the SI system o...

In the SI system of measure, what is the unit of capacitance? Ans: In the SI system of measure, farad is the unit of capacitance.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd