Discussion
Energy density and power density differ in that energy density measures how much is stored and power density how
Answer: A
Correct answer: fast it can be delivered
Energy density is capacity per unit mass or volume - how much is stored; power density is the rate at which it can be moved in or out. The two are largely independent and often opposed: a supercapacitor has a very high power density and a low energy density, while a fuel or a battery has the reverse. Matching the duty to the right corner of that trade is the whole of storage selection.
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