1. 
   Electronvolt
   In physics, the electron volt (symbol eV; also written electronvolt) is a unit of energy equal to approximately {val|1.602|e=-19} joule (symbol J). By definition, it is the amount of energy gained by the charge of a single electron moved across an electric potential difference of one volt. Thus it ...
   Found op http://en.wikipedia.org/wiki/Electronvolt
   
   
2. 
   electronvolt
   special unit of energy equal to the change in energy of an electron passing through a potential difference of 1 V in vacuum NOTE 1 - 1 eV = 1,602 18 x 10^-19 J (approximately) NOTE 2 - This unit of energy is admitted for use along with SI units.
   Found op http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=393-14-21
   
   
3. 
   electronvolt
   a unit of energy equal to the kinetic energy acquired by an electron in passing through a potential difference of 1 volt in vacuum 1 eV = 1.60219 ? 10^-19 J approximately
   Found op http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=881-04-12
   
   

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