# Question #591b0

Oct 19, 2015

The electron volt (eV) is the work done in moving one electron through a potential difference of 1 volt.

#### Explanation:

If 1 Coulomb of charge is moved through a potential difference of 1 volt then 1 Joule of work is done.

Since the charge on the electron is $1.6 \times {10}^{- 19} \text{C}$ then :

$1 e V = 1.6 \times {10}^{- 19} \text{J}$

The erg is an obsolete, non-SI unit for energy. It has the units $g . c {m}^{2} \text{/} {s}^{2}$.

It's a very small unit. According to Wiki it's the energy equivalent of a fly doing a push-up.

1 erg $= {10}^{- 7} \text{J}$

So 1eV$= \frac{1.6 \times {10}^{- 19}}{{10}^{- 7}} = 1.6 \times {10}^{- 12} \text{erg}$