One method of determining harmonic problems on single-phase systems is to make two separate current checks. When this is performed, a ratio of average to true-RMS equal to one indicates _____ harmonic distortion.

A) ​no
B) ​moderate
C) ​extreme

True-RMS

A measurement of an alternating current or voltage, representing the square root of the average of the squares of the instantaneous values.

Harmonic Distortion

A distortion occurring in a signal when frequencies are multiples of the fundamental frequency, affecting the quality and clarity of audio and visual signals.