Considering the analogy between electrical circuit and thermal circuit, show your approach to derive an expression for the thermal resistance for a wall

Thermal resistance for a wall depends on the material, the thickness of the wall and the cross-section area.

Explanation:

Current flow and heat flow are very similar when we are talking about 1-dimensional energy transfer. Attached you can see a picture we can use to describe the heat flow between the ends of the wall. First of all, a temperature difference is required to flow heat from one side to the other, just like voltage is required for current flow.  You can also see that represents the thermal resistance. The next image explains more about the parameters which define the value of the thermal resistances which are the following:

A expression to define  the thermal resistance for the wall is as follows:  , where  l is the distance between the tow sides of the wall, that is to say the wall thickness; A is the cross-section area and k is the material conducitivity.

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explanation: