Walter Maxwell wrote:


The same problem exists with the term "power flow." Engineering
textbooks define power as the "quantity of energy passing a point per
unit time." Thus, power does not flow--energy flows. However, except
when reciting the definition of power, textbooks and journals on wave
propagation use the term "power flow" almost exclusively, with only an
occasional use of "energy flow." As with "current flow," we know what
is meant because of the common usage which generally overshadows the
strict definition."
Perhaps this explanation will satisfy Jim, but perhaps not. We'll see.

Walt, W2DU


Hi Walt,

I am familiar with the common usage of the expression 'power flow' and
of course the Poynting vector. I've been explaining that "energy flows -
not power" on this newsgroup for 4 years and have gotten nothing but
grief for it. I think it will be more interesting to see whether your
explanation will satisfy the others.

73, ac6xg