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 0.5 indicates _____ harmonic distortion.

A) ​no
B) ​moderate
C) ​extreme

True-RMS

A measurement of AC voltage or current that accurately reflects the root-mean-square value, providing a true representation of power in a circuit, regardless of waveform shape.

Harmonic Distortion

A deviation from the ideal wave form in signals, generally due to the presence of frequencies that are multiples of the original signal's frequency.