Actually, all you've got to do to understand this is to realize that
energy is the time integral of power. (Remember that "useless" quantity
of power as a time function?) When you integrate power to get energy,
you get a constant. That constant is the energy present when power = 0,
and it has to be evaluated by knowing something other than just the
power. In a transmission line, that energy is stored in the electric
and/or magnetic fields during the times energy isn't moving (i.e., when
p(t) = 0). Really, math is cool.

Roy Lewallen, W7EL

W5DXP wrote:
wrote:

Are you saying that there can be power when the voltage or current
is always 0? And that this is the error in the sequence of steps
which makes Assertion A false?


There can and does exist component energy when the NET power is zero.
You will understand this when you understand complete destructive
interference in light waves represented by the equation
. . .