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#10
September 4th 03, 01:38 PM
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"Dr. Slick" wrote:
wrote in message ... And yes, |rho| can be greater than unity for a passive load. ...Keith Absolute Rubbish.. Could you produce a passive circuit that will reflect a greater voltage than what you feed it? I'd LOVE to see that... Several examples have been presented, but rather than accepting them, you changed the definition of rho. Perhaps you could build one of these circuits to determine if modifying the definition of rho was appropriate. The ratio Pref/Pfwd is directly related to the ratio [rho]. Pref/Pfwd = [rho]**2 Absolute value brackets are a must! Consider that after the absolute value brackets, the phase information is gone. But since we are going to a ratio of average (RMS) values OR peak values of power, it doesn't matter. In other words, if you use V**2/R, the "V" can be either peak or RMS, it doesn't matter, because it is a ratio. And of course, the "R" doesn't matter either. And of course, the phase information is gone with the absolute value brackets. If you agree that the Pref/Pfwd ratio cannot be greater than 1 Which I haven't since Pref and Pfwd are just computed numbers and the result for some circuits is that Pref/Pfwd is greater than 1. Of course, Pnet is not equal to Pfwd-Pref in these circumstances so there is no violation of basic physics. It is just that the computation of Pfwd and Pref does not really produce real powers (though, again unfortunately, the dimension of the quantity produced is power). for a passive network, then neither can the [Vref/Vfwd]= rho be greater than 1 either. ....Keith |
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