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Power is defined as the rate of energy transfer into, out of, or within:
AA system
BA vacuum
CA magnet
DA crystal
Answer & Solution
Correct answer: A. A system
1. Power is a rate, so it needs a thing that gains or loses energy.
2. Energy can move into, out of, or within a collection of objects.
3. Power is defined as the rate of energy transfer into, out of, or within a system.
4. It is also described as the rate at which work is done.
_Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 7 'Work, Energy, and Energy Resources', sections 7.1-7.9_
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