Energy is the conserved quantity associated to time-translation invariance and represents the work a system is capable of doing. Use this tag for questions about energy, and consider adding energy-conservationthe [energy-conservation] tag if it is specifically about its conservation.
excerpts don't support formatting; the standard way of referring to tags in excerpts on Stack Exchange is just a pair of square brackets: https://meta.stackexchange.com/a/269503/295232; links in wiki updated to HTTPS while we're at it
Glorfindel
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Added guidance to excerpt; various improvements in content and wording.
ACuriousMind ♦
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Manishearth
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