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

Define doppler''s effect of light, The process of apparent change in freque...

The process of apparent change in frequency (or wavelength) of the light because of relative motion among the source of light and the observer is known as Doppler's effect.

Uncertainty principle, Uncertainty principle (W. Heisenberg; 1927): A ...

Uncertainty principle (W. Heisenberg; 1927): A principle, central to quantum mechanics, that states two complementary parameters (such as position & momentum, energy & time, o

Adiabatic reversible expansion of a gas, Get an expression relating T and V...

Get an expression relating T and V in an adiabatic reversible expansion of a gas obeying the equation of state PV = nRT.

Explain about the dispersion in optical fibres, Explain about the dispersio...

Explain about the dispersion in optical fibres. Dispersion in optical fibres: Into optical fibers, temporal distribution of optical pulses because of dispersion will lead to

Experiment of cutting a glass dish from a used electric bulb, Cutting a gla...

Cutting a glass dish from a used electric bulb The hemispherical bottom of an electric light bulb gives a useful glass dish; a soldering iron can be used to cut it off. put the

Which one of the following pairs is not correctly matched, Which one of the...

Which one of the following pairs is not correctly matched: (1) Rutherford-Proton (2) J.J. Thomsom-Electron (3) J.H. Chadwick-Neutron (4) Bohr-Isotope Ans:(4)Bohr-Is

Ac output resistance in common emitter configuration, AC Output Resistance ...

AC Output Resistance in Common Emitter Configuration Ratio  of  change  in collector-emitter voltage (?V CE ) to the change in collector current (?I C ) at constant base curren

Current electricity, Why do magnetic field lines contract longitudinally an...

Why do magnetic field lines contract longitudinally and exert a lateral pressure?

Refraction law, Refraction law: For a wavefront travelling by a bounda...

Refraction law: For a wavefront travelling by a boundary among two media, the first along a refractive index of n 1 , and the other with one of n­, the angle of incidence thet

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