noun (used with a singular verb)
the branch of physics that deals with energy.

1850–55; see energetic, -ics

energeticist, noun
energetistic [en-er-ji-tis-tik] , adjective
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World English Dictionary
energetics (ˌɛnəˈdʒɛtɪks)
(functioning as singular) the branch of science concerned with energy and its transformations

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The challenge turns out to be energetics, although in a somewhat more subtle
Heat has been added to the system, and the energetics are now at a higher state.
How the body works can be approached in different ways, from medical
  perspectives to energetics, from ecology to evolution.
And you gave me the idea that shows that the energetics of that german kids
  theory works.
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