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-   -   Rms voltage (http://www.physicsforums.com/showthread.php?t=650216)

lavster Nov7-12 03:47 AM

rms voltage
 
If I have a wave that looks pretty much sinusoidal but the peak positive amplitide is greater than the peak negative applitude how do I calcualte the rms vlaue - is it still the peak positive amplitude divided by root 2?
Thanks :)

nicklasaau Nov7-12 03:53 AM

Re: rms voltage
 
I would take an average of the amplitudes. but how large is the difference? If you take an average it would be equal to move the refrence point to where the amplitudes is equal for both the negative and the positive. and then it is a perfect sinusoid.

Philip Wood Nov7-12 07:28 AM

Re: rms voltage
 
Interesting question!

Unless I've miscalculated, the rms voltage is given by [itex]\sqrt{V_1^2 + \frac{V_0^2}{2}}[/itex] in which V1 is the constant offset voltage and V0 is the amplitude of the sinusoidal voltage.

Calculations can be revealed if requested!


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