# Re: Repost RE: Explain 3 Phase

```Original poster: "Alex Crow by way of Terry Fritz <twftesla-at-uswest-dot-net>" <alexcrow-at-blueyonder.co.uk>

Nope, with the batteries back-to-back the ends would be "in-phase", ie the
same voltage at each end of the stack, and no voltage between them. When they
are in true series, one end is at +ve Vbatt, the other at -ve Vbatt, ie out
of phase, and you see the total voltage across the two ends. Now make these
batteries two 'magic' AC batteries and you will see what I mean... This
really hasn't got much to do with connecting things in series though, it's to
do with comparing two voltages/signals.

Alex

On Thursday 03 May 2001 14:59, Tesla list wrote:
> Original poster: "Tuite, Tom by way of Terry Fritz <twftesla-at-uswest-dot-net>"
<snip>
You see, if you hold two 3V batteries in your hand and put them in series
> both facing in the same direction.  Then, if you take a DMM and read the
> voltage from the - terminal of the first battery to the + terminal of the
> second, you will get a 6V reading. So, you COULD say the battery voltages
> are "in phase" (though really I would never say this).  If, now you took
> one battery and flipped it around, and then took your DMM reading again,
> this time from - terminal to - terminal, you would get a 0V reading and now
> you could say the battery voltages are 180 degrees out of phase (ok silly
> example, but hey it works :) ).  The same applies to the above mentioned
> hook-ups.  Oooooooo and while I am posting, has any one here head of the
> Hall effect?  I was wondering if any one has experimented with controling a
> primary with a Hall effect swtich, hehe being an ultra newbie coiler I am
> prob not the one to try :)
>
> Tom T.
>

```