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
Plane and The Wind Vectors and Projectiles Suppose the three planes within the animation below. Every plane is heading south along with a speed of 100 mi/hr. Every plane flies

E lectrons have very much smaller mass than that of ions, so they respond more rapidly to a changing electric field. For electric field that oscillates at extremely high frequencie

A body moving in the positive x direction passes the origin at time t=0. Between t=0 and t=1 second, the body has a constant speed of 24 meters per second. At t=1 second, the body

Charging an Electrophorus by Induction Using a Negatively Charged Object A general physics demonstration includes the charging of an aluminum pie plate through the procedure of


The cantilevered beam below is supported at O.  F1 and F2 in kN are given in P21 and P22 respectively and act on the beam as shown.  Determine the magnitude and direction of a sing

Two speakers are driven by the same oscillator whose frequency is f. They are located a distance d from each other on a vertical pole. A man walks straight toward the lower speaker

THOMSON'S ATOMIC MODEL:- According to Thomson's atomic model positive charge is distributed uniformly over the entire body of the atom while the electrons are embedded in it. S

A dragster begins from rest and accelerates for 4.0 s at a rate of 5.0 m/s2. It then travels at a constant speed for 2.5 s. A parachute opens, stopping the vehicle at a constant ra

In an electric field   a charge (Q) experiences a force F = QE. If charge is positive then force is directed in the direction of field whereas if charge is negative force acts on i