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I am trying to get my head around the temperature coefficient of resistance; that is, the fact that the resistance of a metal (in this case, copper) will change as the temperature of the metal changes. This coefficient is given a value (for copper this is usually given as around 0.00393 per °C) meaning that a metal of resistance 1Ω at 20°C will be at 1.00393Ω at 21°C.

I hope my understanding so far is correct, but what I don't get is that apparently the coefficient itself changes with temperature. So once we get to 30°C or 50°C the rate of change of resistance has changed. Is this correct? I haven't been able to find any sources which give values for this, only for the coefficient at 20°C or 25°C.

Any clarification on this point would be very helpful. Thanks.

Jonathan