Power Factor is the ratio between the apparent power (VA) and the real power (W). Energy suppliers deliver electricity with a sine voltage wave at 60 Hz. If the current and voltage waves are not aligned, the system’s efficiency is diminished and the apparent power is greater than the real power. In an inductive system, the voltage wave is ahead of the current wave. In a capacitive system, it is the current sine wave that is ahead of the voltage sine wave. In order to compensate for the inductive effect of motors, correction is achieved using capacitors to align the two waveforms.