Dave wrote:
In the case being discussed instead the power dissipated in the load
varies with NO CHANGE in total power delivered by the sources.

no way. Prove there is no change in the power delivered by the sources.

Piece of cake. The sources are beams of light from Alpha Centauri.
Now tell us exactly how Alpha Centauri adjusts its power output
from 11 light-years away.
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73, Cecil http://www.w5dxp.com