When replacing a power transistor fitted with a heat sink in a circuit, a coating of silicone grease is applied between the transistor case and the heat sink. Why is this done?
β’ Role of a heat sink in electronic circuits β’ How thermal conduction works between two solid surfaces β’ Effect of air gaps or rough surfaces on heat transfer
β’ Think about whether you want more or less heat to stay in the transistor when using a heat sink. β’ Consider what happens at the microscopic level where the metal case of the transistor touches the metal heat sink. β’ Ask yourself what property of silicone grease is most important here: is it slipperiness, or something related to temperature and heat flow?
β’ Identify the main function of a heat sink in an electronic circuit. β’ Decide whether any mechanical movement is intended between the transistor and heat sink in normal operation. β’ Verify which option mentions heat transfer rather than just lubrication or ease of removal.
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