Discussion
Which term in the thermal chain does a larger heatsink reduce?
Answer: B
A bigger or better-ventilated sink reduces only its own resistance to the surrounding air. The device's internal path is fixed at manufacture and the interface depends on the mounting rather than on the sink's size. Since the sink term is usually the largest, attacking it is usually right - but once it has been reduced below the other two, further enlargement buys almost nothing, which is a limit worth checking before ordering a larger extrusion. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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