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[[Gambar:Sun_in_February_(black_version).jpg|thumb|right|[[Srengéngé]] yaiku sumber ènergi kanggo [[kauripan]] ing [[Bumi]]. Srengéngé ngasilake utamane [[energi termal|ènergi termal]], [[energi panas|ènergi panas]] lan [[energi radian|ènergi radian (cahya)]].]]
Ing [[fisika]], '''ènergi''' iku [[Properti fisika|properti]] saka obyèk kang bisa [[Transfer energi|ditransfer]] kanggo obyèk liyaneliyané utawa diowahi menyang macemwerna-macemwerna bentuk.<ref>{{Cite book|title = Thermal Physics|url = https://books.google.com/books?id=c0R79nyOoNMC|publisher = Macmillan|date = 1980-01-15|isbn = 9780716710882|language = en|first = Charles|last = Kittel|first2 = Herbert|last2 = Kroemer}}</ref> "Kemampuan saka sistem kanggo nindakake karya" iku gambaran kang umum, nanging ora bener amarga ènergi ora kudu kasedhiya kanggo karya.<ref>{{cite book|title=Biomechanics and Biology of Movement|author1=Benno Maurus Nigg |author2=Brian R. MacIntosh |author3=Joachim Mester |publisher=Human Kinetics|year=2000|isbn=9780736003315|page=12|url=https://books.google.com/books?id=1BG78utt6VUC&pg=PA12&dq=energy+%22capacity+to+perform+work%22#v=onepage&q=energy%20%22capacity%20to%20perform%20work%22&f=false}}</ref> Kayata, ing [[International System of Units|Unit SI]], ènergi diukur nganggo [[joule]], lan siji joule wis ditetepake "kanthi mekanikmékanik", kang ènergi ditransfer kanggo obyèk kanthi [[karya mekanikmékanik]] saka obah kadohan saka 1 [[metermèter]] marang [[gaya]] 1 Newton.<ref group=note>Energi (lan satuané) kerepé didèfinisikaké nganggo [[Karya (fisika)|karya]] kang bisa dilakoni. Tapi, tèknisé iki mung kira-kira, amarga [[hukum térmodinamika kaping pindho]] artine karya kang bisa dilakoni sawijining system mesthi kurang saka energi total sistem, amarga [[panas buangan]]. Delok: {{cite web|url=http://www.loreto.unican.es/Carpeta2012/TPT%28Lehrman%29WorkEnergy.pdf|title=Energy is not the ability to do work|author=Robert L. Lehrman|publisher=The Physics Teacher|year=1973|language=basa Inggris|trans-title=Energi iku dudu kemampuan nglakoni karya}}</ref> Nanging, ana akèh definisi sanès ènergi, gumantung ing konteks, kayatakaya ta ènergi termal, ènergi radian, elektromagnetik, nuklir, etc., ngendi ukara asalé sing paling trep.
==Cathetan==
* {{cite book |title=Light and Matter|last= Crowell|first= Benjamin|year=2011|origyear=2003|publisher= Light and Matter|location=Fullerton, California|url=http://www.lightandmatter.com/html_books/lm/ch11/ch11.html|language=basa Inggris |trans-title=Cahya lan Matèri}}
* {{cite web|last=Ross|first=John S. |title=Work, Power, Kinetic Energy |url=http://www.physnet.org/modules/pdf_modules/m20.pdf|work=Project PHYSNET|publisher=Michigan State University|date=23 April 2002|language=basa Inggris|trans-title=Karya, Daya, Energi Kinetik}}
* {{Cite book|author=Smil, Vaclav|title=Energy in nature and society: general energetics of complex systems |year=2008 |publisher=MIT Press |location=Cambridge, USA |isbn=0-262-19565-8|language=basa Inggris|trans-title=Energi ing alam lan masyarakatmasarakat: energetika umum saka sistem komplèks}}
* {{Cite book|author1=Walding, Richard |author2=Rapkins, Greg |author3=Rossiter, Glenn |title=New Century Senior Physics |date=1999-11-01 |publisher=Oxford University Press |location=Melbourne, AustraliaOstrali |isbn=0-19-551084-4|language=basa Inggris|trans-title=Fisika Senior Abad Anyar}}
{{refend}}
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