Discussion
A drive whose devices dissipate 3 kW in total needs a heatsink and airflow capable of removing
Answer: A
Correct answer: 3 kW at the permitted temperature rise
The heatsink must remove the whole 3 kW while holding the junctions below their limit, so the thermal resistance from junction to ambient must be low enough that the product of loss and resistance leaves a margin. Removing 3 kW at any temperature rise would be trivial and useless - the rise is the whole of the requirement.
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