>>18969822>RMS is the average of the absolute value and the equivalent to DC voltage.for a pure sine wave, RMS (root meann square) is the DC value that would deliver the sam power in Watts to a resistive load. In reality, AC powerlines are only approximately sinusoidal, there is lots of harmonics and distortion due to motors etc pulling weird currents
t. Fluke 189 True RMS meter was the best, it has been downhill from there