Electric Force
Charge is a fundamental quantity, like length, mass and time. The unit of charge in the MKS system is called the Coulomb.
When charges are in Coulombs, forces in Newtons, and distances in meters, the Coulomb constant, k, has the value:
k = 9.0 x 109 Nt*m2 / Coul2 . (Compare this to G which is 6.67 x 10-11 Nt*m2 / kg2 !)