# Where does this energy equation come from: $E_k=k\frac{k(q_1q_2)}{r}$

I have this equation but I have no idea where it came from.

$E_k=k\frac{(q_1q_2)}{r}$

I don't understand especially since I have this other equation:

$E = k\frac{Q_{source}}{r^2}$

And cannot find any relation between the two. Please any helps or suggestions would be useful. Thanks!

EDIT: I have researched this and either am looking in the wrong place or just can't find it anywhere so please help! :)