Compare equations for rate of flow of heat through a conductor and current through a conductor and write the expression for thermal resistance.

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Solution

The rate of heat flow between two systems is measured in watts (joules per second). The formula for the rate of heat flow is
∆Q/∆t = −K A ∆T/x,
where ∆Q/∆t is the rate of heat flow, −K is the thermal conductivity factor, A is the surface area, ∆T is the change in temperature, and x is the thickness of the material (∆T/x is called the temperature gradient and is always negative because the heat always flows from the higher temperature to the lower).

Thermal resistance= QL/A∆T

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