"Floyd L. Davidson" wrote in message
...

The problem is that "direction" only has meaning when measured
in comparison some specific point of reference. If you have
three different reference points, one at the DC level, one at
the peak positive swing and one at the peak negative swing, you
have three very different views of "direction" for current flow:

Reference Direction
Point of flow
========= =====================================

Peak Pos All Negative

DC level Equal cycles of Positive and Negative

Peak Neg All Positive



I think "zero" is a good reference for current flow, and that the actual
(absolute) direction can be measured. Voltages have the reference issues.

j