On 25/05/2010 18:56, Roy Lewallen wrote:
Another bit of reading that might help shed light on the matter is
http://eznec.com/misc/Food_for_thought.pdf, written eight years ago
during one of the many times the subject has come up before on this
newsgroup.


Roy's notes lead you into thinking about instantaneous power, and the
behaviour over a complete AC power cycle. Thinking that through, and the
implication about the power/time graphs at various points on the
transmission line gives insight into average energy flow, and energy
exchange between line sections, line and load and line and source, and
the physical bounds of exchange of stored energy during a cycle.

The Telegraphers Equation that I mentioned earlier captures the
behaviour of the line, and basic AC circuit theory, Joule's law etc
takes you the rest of the way.

Sure, working these things through takes time... and there isn't much
afforded in today's world of instant gratification where appealing
explanations are more accepted, irrespective of whether they are correct.

Miguel, invest in yourself and your knowledge, don't accept explanations
because of a vote count, accept them because they reconcile with things
that you truly know as facts (which sometimes means challenging what you
think you know).

Owen