#### wuchy143

##### Member

So basicly what is the calculation for RMS? Why do we do it? I've just accepted it for what it is...divide the amplide of the sinusoid by sqrt(2) and that's it.

Is a 20V RMS AC signal the same as a 20V DC signal? I would think not but have heard conflicting information even from professors. Also, I guess a better question would be if a hook up a load resistor to a 20V DC source will it heat up the resistor(dissipate as much energy) just as much as a 20V AC source.

Last question is what's the point of RMS voltage?

Thanks for any replies!

-mike