There is an electrical analogy with conduction heat transfer that can be exploited in problem solving.
The analog of Q is current, and the analog of the temperature difference, T1-T2, is voltage difference.
From this perspective the slab is a pure resistance to heat transfer and we can define:
We may develop an electrical analogy for radiation, similar to that produced for conduction.
The two analogies should not be mixed: they have different dimensions on the potential differences, resistance and current flows.
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