Re: Full wave rectified RMS voltage
Yes, the inclusion of the reference to a sine wave was a mistake - I'd already said that in a round about way in my earlier posts in relation to distorted 'sine waves'. Only the .707 figure is relative to a pure sign wave. I'd also mentioned the RMS voltage of a (virtual) square wave.
As Chris says, the RMS value of an AC current is the value that gives the same heating power as the equivalent DC value. In other words, if you connected two identical heaters, one to a 200V DC supply and the other to a 200V (RMS) AC supply, both would would produce exactly the same heat output.
Apologies for the confusion - I should have spotted it myself and corrected it.
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