Neil wrote:

On 2/18/08, James Knott wrote:

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Aaron Kulkis wrote:

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RMS is just as statistical method, which is useful for making sense of any time-variant function.

The square root of the square of power is just as much related to power as the square root of the square of voltage is related to voltage (NOT power).

Judging from this response and the one to Randall, I suspect it might be a good idea for you to review your EE texts. RMS is meaningless in the context of power. Sure you can do the calculation, but what does it get you? With current or voltage, RMS derives the equivalent DC value. Can you explain what you'd obtain by calculating RMS power?

I'd say "RMS power" should be calculated as average power. Wikipedia seems to back me up. http://en.wikipedia.org/wiki/Root_mean_square.

Does anyone have a program wich can test wether "RMS power" and average power is the same? Just insert a matrix of a squared sine into it and let it calculate the average and the RMS. If this is the case it would clearly show why there are people claiming RMS power is meaningles, and there are people claiming RMS power is important.

RMS power and average are not the same thing. When you calculate RMS voltage or current, you then use the result as a continuous DC voltage, which in turn can be used to calculate average power. Applying RMS calculation to power, gives meaningless results.

Oh yea, I'd be curious wich program is able to calculate with matrices. I have been looking for one (not verry actively I must admit)

It's been over 20 years since I've had to work with matricies. -- Use OpenOffice.org http://www.openoffice.org -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org