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Keith Dysart wrote:
On Mar 4, 10:25 pm, Cecil Moore wrote: Nobody has ever claimed that the energy/power analysis applies to instantaneous values. Are you saying that conservation of energy does NOT apply to instantaneous values? Of course not. I am saying that the 50 watts in the source resistor power equation is an average power. It is invalid to try to add instantaneous power to an average power, as you tried to do. The energy/power values are all based on RMS voltages and currents. There is no such thing as an instantaneous RMS value. I understand the analysis technique you are proposing. That it leads to the wrong conclusion can be easily seen when the instantaneous energy flows are studied. This merely demonstrates that the analysis technique has its limitations. The proposed analysis technique is a tool. Trying to apply that tool to instantaneous powers is like trying to use a DC ohm-meter to measure the feedpoint impedance of an antenna. Only a fool would attempt such a thing. The bottom line remains that the reflected energy is not dissipated in the source resistor, even for the special cases under discussion. Saying it doesn't make it so, Keith. There is nothing to keep the reflected energy from being dissipated in the source resistor. If the reflected energy is not dissipated in the source resistor, where does it go? Please be specific because it is obvious to me that there is nowhere else for it to go in the special zero interference case presented. Here are some of your choices: 1. Reflected energy flows through the resistor and into the ground without being dissipated. 2. The 50 ohm resistor re-reflects the reflected energy back toward the load. (Please explain how a 50 ohm load on 50 ohm coax can cause a reflection.) 3. There's no such thing as reflected energy. 4. Reflected waves exist without energy. 5. ______________________________________________. -- 73, Cecil http://www.w5dxp.com |
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