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.

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

Ask an Expert

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

Write your message here..

Related Questions

Nominal resistance, The resistances of commercially-available discrete resi... The resistances of commercially-available discrete resistors are restricted to particular sets. For example, the available values of resistors with 10% tolerance are selections fro

Photomultiplier tube(ptm), Photomultiplier tube(PTM) it can detect a we... Photomultiplier tube(PTM) it can detect a weak flash of light and estimate the amount of light .The principle of operation (fig(4)) a light photon released electron at the phot

The conservation of linear momentum, Hi, Good day. I enjoy watching your ph... Hi, Good day. I enjoy watching your physics videos, but I have a question and was wondering if you can answer it for me showing the working. the question is as follows: A flat truc

Resistors in dc circuits, Resistors in dc circuits: Components are said... Resistors in dc circuits: Components are said to be in series when they are connected end-to-end providing only one path for the current.  Thus the same current passes through

Thermonuclear reactions, Thermonuclear reactions: The fusion reactions ... Thermonuclear reactions: The fusion reactions which require extremely high temperatures are called thermonuclear reactions. The most important thermonuclear reactions take plac

What is a starry sky, What is a starry sky? Probably one of the most be... What is a starry sky? Probably one of the most beautiful lighting effects which can be created that can be very simple or rather sophisticated. In its simplest form, a starry s

Why capacitor blocks d.c. but allows a.c., Q. A capacitor blocks d.c. but a... Q. A capacitor blocks d.c. but allows a.c. Why? Capacitive reactance   XC = 1/ω C        = 1 / 2πν C Where ν is the frequency of the a.c. supply. In a d.c. circuit

Determine about the stacking fault, Determine about the Stacking fault     ... Determine about the Stacking fault       Stacking faults happen in a number of crystal structures, but the common example is in close-packed structures.  Face-cantered cubic (f

Determine the power absorbed by the circuit, A 20 Ω non-reactive resistor i... A 20 Ω non-reactive resistor is connected in series with a coil of inductance 80mH and negligible resistance. The combined circuit is connected to a 200V, 50Hz supply. Calcula

Medical uses of cryogenics-cryosurgery, Medical uses of cryogenics Low tem... Medical uses of cryogenics Low temperature have been used for long term preservation of blood, sperms, bone marrow and tissues. Cryosurgery The cryogenic methods used to