Temperature co-efficient of resistance, Physics

The temperature co-efficient of resistance:

The temperature co-efficient of resistance is defined as;

          The Fractional change in resistance from 0ºC, per degree temperature change.

and may be represented graphically as shown below.

The graph is reasonably linear for many materials over a moderate temperature range (0º - 200ºC).

The units are ºC because the ohms cancel out in the calculation.

Materials whose resistance increases with increasing temperature have a positive temperature co-efficient of resistance.

Materials whose resistance decreases with increasing temperature have a negative temperature co-efficient of resistance.

2046_TEMPERATURE CO-EFFICIENT OF RESISTANCE.png

Some materials have very small temperature co-efficients of resistance and are used where it is important that the resistance does not change with temperature.  Examples are Manganin and Eureka.

 

 

 

Posted Date: 9/13/2012 3:03:11 AM | Location : United States







Related Discussions:- Temperature co-efficient of resistance, Assignment Help, Ask Question on Temperature co-efficient of resistance, Get Answer, Expert's Help, Temperature co-efficient of resistance Discussions

Write discussion on Temperature co-efficient of resistance
Your posts are moderated
Related Questions
Boat A is travelling at 4.6 m/s. Boat B is moving away from boat A at 9.2 m/s, as shown in the figure below. The captain of boat B blows an air horn with a frequency of 550 Hz

mass of body= 4 kg is dropped form height= 45 m Calculate the kinetic energy just before hitting the ground

how may six digit numbers can be made in which the sum of the digits is even?

Draw a free-body diagram for the space shuttle just after it leaves the ground.  Recognize the forces acting on the shuttle. Make sure that you do not neglect air resistance.

The beam below is supported at A and B.  F1 and F2 in kN are given in P21 and P22 respectively.  F3 in kN is given in P23 and the couple in kN.m is given in P24.  Assume that F1, F

(i) Value of vibration of a particle is described as the number of vibrations done by particle in one second. (ii) It is the value of total wavelengths traversed by the wave in

composiotion of two simple harmonic motions ai right angles to each other nd having time period in the ratio 1:2

why fall an apple from a tree

Circular Polarisation Circular polarisation produced from a linearly polarised electromagnetic wave through a quarter-wave plate.

Explain about the monochromaticity of laser. Monochromaticity: The light emitted through a laser is monochromatic, that is this is of one wavelength (colour). Although in ca