https://en.wikipedia.org/wiki/Joule_heating#Microscopic_description https://en.wikipedia.org/wiki/Joule_heating#Microscopic_desc... Basically, physical movemen

https://en.wikipedia.org/wiki/Joule_heating#Microscopic_description https://en.wikipedia.org/wiki/Joule_heating#Microscopic_desc... Basically, physical movement of electrons involved in the current flow is hindered by other electrons.