Roger Sparks wrote:
OK Cecil. I understand that none of your discussion applies
to instantaneous values, only average values.

Indeed, instantaneous values are a diversion away from
my discussion/article/example using average values.

I am examining Keith's spread sheet carefully. I found that
Open Calc will open the spreadsheet so I can read Keith's cell
directions. (Thanks for making the spread sheet available
Keith.) I want to make sure that I fully understand what is
happening here, to the best of my ability and time available.

Given the superposition of two voltages, when the two
voltages have the same sign, constructive interference
is present. When the two voltages have opposite signs,
destructive interference is present. The destructive
interference during each cycle exactly equals (and
supplies) the constructive interference during the
same cycle so the average interference is zero.
--
73, Cecil http://www.w5dxp.com