How do you actually determine the sources of power use and loss in your design?
Efficiency and its complement of inefficiency are hot topics both in the general media and in the nitty-gritty of engineering design. No need to go over the reasons for that here: if you're reading this, you know about the consequences of inefficiency with respect to power use, run time, immediate cost, thermal load, packaging, and more.
Statistics calling out power use and therefore room for improvement are tossed around like paper clips; I've seen statements such as "60% of the power in the US is consumed by electric motors," "50% is used in transportation," and "25% is used for home heating and cooling."
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