The electrostatic and electromagnetic systems are derived from units of length and force, mainly. As such, these are ready extensions of any system of containing length, mass, time. Stephen Dresner gives the derived electrostatic and electromagnetic units in both the foot–pound–second and foot–slug–second systems.
Electrostatic and electromagnetic systems are based on units of length and force, which are readily adaptable to any system involving length, mass, and time. Stephen Dresner has provided these units in both the foot-pound-second and foot-slug-second systems.