Harmonics (electrical power)  From Wikipedia, the free
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navigation, search  Harmonic voltages and currents in an
electric power system are a result of non-linear electric loads.
Harmonic frequencies in the power grid are a frequent cause of
power quality problems. Harmonics in power systems result in
increased heating in the equipment and conductors, misfiring in
variable speed drives, and torque pulsations in motors.
Reduction of harmonics is considered desirable.  Current
harmonics[edit]  In a normal alternating current power system,
the current varies sinusoidally at a specific frequency, usually
50 or 60 hertz. When a linear electrical load is connected to
the system, it draws a sinusoidal current at the same frequency
as the voltage (though usually not in phase with the voltage).
Current harmonics are caused by non-linear loads. When a non-
linear load, such as a rectifier, is connected to the system, it
draws a current that is not necessari