Makamashi shine duk wani abu da ake hada shi tareda wasu abubuwan domin su cakudu, su bayar da wuta ko wuta mai zafi ko Dan amfani dashi a wurin yin aiki. Ma'anar makamashi da fari anfara amfani dashi ne wurin ma'anar duk wani abu da ka iya bayar da chemical energy amma an dade da canja wurin nufin duk wani abu dake bayarda zafin wuta, kamar wutar nukiliya ta hanyar (via nuclear fission and nuclear fusion). Zafin wutan da makamashi ke fitarwa sanadiyar cakuduwa da wasu abubuwan na canjawa zuwa mechanical energy hanyar, wasu lokutan zafin shima na zama dan dumamawa, dafa abinci ko heat engine, industrial processes.