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I am wondering if anyone knows any correlations or equations that can give me the temperature of a wire due to power losses.

I understand how to calculate the power loss in the wire, based on wire resistance and current (P=I^2*R) but how do I turn this into a heat transfer problem and find a temperature? In other words, how do I know what that power dissipation will heat the wire too? Are their a set of equations that relate temperature, power dissipation and geometry of the wire?

Thanks,

Nick