We always say that copper is a better conductor than Al , this is because the temp coeff of copper is lower than that of Al. But can somebody tell me the connection between copper, temperature and area, or to put it straight how does one arrive at the fact 1 sq mm of copper while carrying 1 Amp of current for 1 hour heats upto what temperature, or to put it in the reverse, I will allow a temperature rise of 40 deg Cent (ie ambient + 40) and with this in mind I would like to choose the area of copper when I pass 1 amp of current for one hour.... is there a formula... hELP
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