Electron volts, expressed in eV, are units of energy. Represents the kinetic energy of an electron (negatively charged 1 .6×10-19c) accelerated by the potential difference of1volt. The conversion relationship between electron volt and energy unit Joule (J) in the international system of units is1EV =1.6021766208 (98) ×10-19j.
James Prescott Joule was born in shafter, a suburb of Manchester. He is a British physicist and a member of the Royal Society. Because of Joule's contribution to heat, thermodynamics and electricity, the Royal Society awarded him the highest honor-Copley Medal. In order to commemorate him, later generations named the unit of energy or work "Joule" or "coke" for short; The first letter "J" of Joule's surname is used to mark the physical quantities of heat and work.
The definition of Joule
Joule is the derived unit of energy, work or heat in the international system of units, with the symbol J. In classical mechanics, 1 Joule is equal to the energy required to exert a force of 1 Newton at a distance of 1 meter. In electromagnetism, 1 Joule is equal to 1 ampere passing 1 ohmic resistance 1 second.