Dr. Honeydew wrote:
Clearly the 40 ohm load dissipates more power than the 50 ohm load, so
we don't see how your answer and Mr. Harrison's posting can both be
correct.

It appears that the internal resistance of the
Thevenin equivalent circuit was chosen to be
~1 ohm. Maximum power transfer of ~13 watts
should occur when the load is ~1 ohm and the
current is ~3.6 amps with ~3.6 volts across
the 1 ohm load and across the ~1 ohm generator
impedance. How one gets 13 watts out of a source
rated for one watt is a non-linear physical
design problem, not a linear theory problem.
--
73, Cecil http://www.w5dxp.com