Jim Kelley wrote:
The dot indicates phase polarity.

A necessity when using DC models for AC circuits. Hint: Balanced
AC has no objective fixed polarity. It is all subjective. (Never
mind that current holes flow out of the '+' terminal of a battery. :-)

Maybe they taught this "convention" in grade school back in the
'40's? I don't know what application it might have here. Maybe you
could point to somewhere in 95-1 where they make use of this
"convention". Or indicate how it might apply to a coil having
alternating current going "in" from both ends.

If you want to see current flowing out of both ends of a coil at the
same time just run http://www.qsl.net/w5dxp/sqcoil.ez at 29 MHz.

Current into the bottom of the coil has a phase angle of -174 degrees,
i.e. referenced to the source, it is flowing toward the source. How
could it be otherwise? That point is ~1/2WL away from the source.

Current out of the top of the coil has a phase angle of -6 degrees,
i.e. referenced to the source, it is flowing away from the source.
How could it be otherwise? That point is ~1WL away from the source.

If you play with the parameters, I'm sure you can shift that -174
degrees to -180 degrees and that -6 degrees to zero degrees.
--
73, Cecil http://www.qsl.net/w5dxp



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