difference - a disagreement or argument about something essential; "he had a dispute with his wife"; "there were irreconcilable differences"; "the acquainted conflict between Republicans and Democrats" This incessant jostling is kinetic energy, and the sum of it—across trillions and trillions of particles—is what we phone thermal Electrical power. https://localized-thermal-test-sy02355.blogminds.com/5-easy-facts-about-pcb-thermal-cycling-failure-modes-described-32728846