I"m not wrong... they ( Vrms and Vavg ) are both methods of measurement of voltage or as you said... calculate it.
PWM is something else... it is a type of output where the voltage is pulsed ( on/off ) as apposed to an analog output. You can use either Vavg or Vrms to measure a PWM output...
If the output is "flat" (DC) then Vrms = Vavg.
If the output is a PWM waveform, usually a square wave, then Vrms <> Vavg
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I don't understand any of that stuff either Wolands or the AVG, BAC, VWM, MBC, ABC, STD, RSD, it all means nothing to me but I'll tell ya I'd never spend that much money on a PV unless it was more useful then puffing on the end of it to make a vapor cloud. It would have to clean my house, wash my car, pick up the yard, do my grocery shopping or something
I just can't justify that kind of expense for a battery to heat a coil and give me vapor 
Oh Zippeys