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Atomic and Nuclear Physics

The Electron Volt (eV)

The electron Volt is a unit of work (or energy) much smaller than the Joule.

If 1electron moves through a potential difference of 1V then 1eV of work is done.

Relation between the Joule and the electron Volt

Potential difference is work done per unit charge so, W = Vq.
1J is the work done when 1C moves through a p.d. of 1V

The charge on one electron is (-)1򊁭0-19C.

Therefore
1eV is the work done when 1򊁭0-19C moves through a p.d. of 1V.

This means that

1eV = 1򊁭0-19J

 

 

To convert energy in J to energy in eV

 

 

 

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