One should also carefully consider the
more interesting variation of the
problem: an open transmission line. In
the steady state we have 100 watts
forward, 100 watts reflected, 200 Joules
in the line, and 0 watts being sourced
by the generator. :-)

ac6xg

Cecil Moore wrote:
Richard Harrison wrote:

Cecil, W5DXP wrote:
"How many joules are contained in that feedline?"

Total joules on the line is 300.


That can be shown to be true by noting that during the
transient buildup to steady-state, 300 joules sourced
by the generator have not yet reached the load. That
remains true until the generator is powered down, i.e.
all during steady-state.

Forward power minus the reflected power equals 100 watts being supplied
by the generator to the load with 200 watts forward power and 100 watts
reflrcted power in the line.


But what about the people who say there's no energy in the
reflected wave? Reckon how they sweep all those joules,
whose energy must be conserved, under the rug? :-)