Jim Kelley wrote:
Cecil Moore wrote:
Just because you use a Sharpie pen to mark one terminal of an AC source
as the '+' terminal, doesn't mean the current out of that terminal
is always positive.

Hey, you're the one who told the story about the 'hot wire' being the
one that the AC comes out of, not me.

You apparently would be surprised to know that the "hot wire" in
your house has a negative voltage on it half the time. Current
flows out of the "hot wire" half the time and flows into the
"hot wire" half the time. That's simply the nature of AC.

There's no "hot wire" in a balanced RF transmission line.

*--------------------------------*-----------*
| | |
| | | |
*-----| |-----------------* | |
| | | voltmeter Ammeter
| | | |
| | | | Load
*-----| |----/\/\/\/\/----* | |
| ccw ^ cw | |
| | |
*----------------*-----------*

There are two batteries and a potentiometer hooked up as shown. With the pot in
the fully ccw position, what does the voltmeter read? Which way is the current
flowing?

With the pot in the fully cw position, what does the voltmeter read? Why way is
the current flowing?

It doesn't take a genius to see that if the pot is turned in a certain repetitive
way, the voltage across the load could be sinusoidal with the current reversing
its direction every 1/2 cycle. There's only two DC batteries and a magnitude pot.
Where's the phase?
--
73, Cecil http://www.qsl.net/w5dxp



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