are currents or voltages with frequencies that are integer multiples of the
fundamental power frequency. Harmonic
frequencies from the 3rd to the 25th are the most common range of frequencies
measured in electrical distribution systems.
Power Factor is a
measure of how efficiently electrical power is consumed. In the ideal world
Power Factor would be unity (or 1). Unfortunately in the real world Power
Factor is reduced by highly inductive loads to 0.7 or less. This inductance is
caused by equipment such as motors, compressors, transformers and fluorescent
lighting ballasts and welding sets, etc.