Resistivity and Temperature Coefficient

You will find that the temperature coefficient of copper at 50°C is virtualy the same as it is at 20°C

No need to Go any where do as given :-

Measure the resistance at t deg C. say Rt

to get the resistance constant Kt use formula Kt = 1/1+0.004 ( t-20)

then R at 20 deg centigrade will be R = Rt X Kt/L

where L is the length of conductor.

Hope you require this only.

Regards

Yogendra Tomar

Your answer implies of course no change in the Coefficent which you quote as 0.004/°C , I believe what the correspondent wished to ask was "what was the change in resistance" between 20°C and 50°C.

The coefficient does of course change with large variatons of temperature but is of no practical concern unless superconduction occurs