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February 14th 06, 09:29 PM
posted to rec.radio.amateur.antenna
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For Roy Lewallen et al: Re Older Post On My db Question
On Tue, 14 Feb 2006 21:25:32 GMT, Owen Duffy wrote:
On Tue, 14 Feb 2006 15:03:05 -0600, (Richard Harrison) wrote: I have not read the thread, but I recall from some old memory store that rms volts times rms amps is one of the definitions of "average power". Only in a DC circuit, or a purely resistive load in an AC circuit. I shouldn't use that work ONLY!!! Only in a DC circuit, or a in an AC circuit (loop) where the current and voltage measured are in phase. In an AC circuit where the voltage and current are not in phase you must multiply the product of the RMS voltage and RMS current by the cosine of the phase difference to get real power (which is what I think you mean by "average power"). Owen -- |
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