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

Moment of thin spherical shell about axis, Moment of Thin Spherical Shell A...

Moment of Thin Spherical Shell About Axis This problem can be set up in spherical coordinates so that conversions from Cartesian coordinates are not required. The mass element

Acceleration, How can I create an acceleration graph with my results?

How can I create an acceleration graph with my results?

Left-hand rule, left-hand rule: It is the opposite-chirality version o...

left-hand rule: It is the opposite-chirality version of the right-hand rule.

Radioactivity, law of successive diintegration

law of successive diintegration

High acuity nursing care, High Acuity Nursing Care: Issues Paper Pu...

High Acuity Nursing Care: Issues Paper Purpose:             The student nurse will use knowledge gained through class work, clinical, and independent library investigati

Zone plate, What is a zone plate? How is it constructed? Show that a zone p...

What is a zone plate? How is it constructed? Show that a zone plate behaves like a convex lens. Deduce the expression for its focal length

Lorentz transformation, Lorentz was the first to obtain the equations which...

Lorentz was the first to obtain the equations which relate the space and time coordinate of two frames of reference moving with a constant velocity with reference to each other and

Instantaneous velocity and instantaneous speed, Can instantaneous velocity ...

Can instantaneous velocity answer instantaneous speed be equal in uniform motion

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