Average Voltage. For the waveform shown above, the peak amplitude and peak value are the same, since the average value of the function is zero volts. Peak-to-Peak Voltage V PP The full voltage between positive and negative peaks of the waveform; that is, the sum of the magnitude of the positive and negative peaks. RMS Voltage V rms The root-mean-square or effective value of a waveform, equivalent to a DC voltage that would provide the same amount of heat generation in a resistor as the AC voltage would if applied to that same resistor.
Average Voltage V avg The level of a waveform defined by the condition that the area enclosed by the curve above this level is exactly equal to the area enclosed by the curve below this level. Notes RMS is not an "Average" voltage, and its mathematical relationship to peak voltage varies depending on the type of waveform. The RMS value is the square root of the mean average value of the squared function of the instantaneous values. Most multi-meters, either voltmeters or ammeters, measure RMS value assuming a pure sinusoidal waveform.
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