![]() Mechanical and structural engineers are more familiar with Hooke's law and so often use it as an analogy when doing calculations involving thermal resistance. Main articles: analogical models and Onsager reciprocal relationsĮlectrical engineers are familiar with Ohm's law and so often use it as an analogy when doing calculations involving thermal resistance. Electronic components malfunction or fail if they overheat, and some parts routinely need measures taken in the design stage to prevent this. The thermal resistance of materials is of great interest to electronic engineers because most electrical components generate heat and need to be cooled. The SI unit of absolute thermal resistance is kelvins per watt (K/W) or the equivalent degrees Celsius per watt (☌/W) – the two are the same since the intervals are equal: Δ T = 1 K = 1 ☌. It is the reciprocal of thermal conductance.
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