# Re: Secondary Voltages

```Original poster: "Stolz, Mark by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Mark.Stolz-at-st-systems-dot-com>

Jim, Terry, All

>From the answers to my question I realize this wasn't the simple question I
thought.  I was under the impression that this was a simple 1 foot = 250kV,
2 foot = 500kV, etc. type thing.  Silly me considering how non linear TCs
are. :-)

Being pretty new to coiling I realize I don't know much and the more I learn
about the principles of TCs it becomes more apparent the less I know.  Thank
goodness for this list and the vast knowledge it contains!

Mark Stolz
Houston, TX

>Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>"
>
>A per foot number isn't particularly appropriate...  For nonuniform fields
>over hundred kV or so(which a TC is), spark length and voltage aren't very
>well correlated, with things like electrode capacitance, available current,
>and field shape being big big factors.
>
>Most tesla coils develop somewhere between 250,000 and 750,000 volts on
>their top load, with the vast majority probably being at the bottom end of
>the spectrum.  It is very hard to get something to 750 kV without breakout
>occurring, and once the spark forms, the voltage drops dramatically.
>
>I think half a million volts is a safe number to bandy about (few people
>will prove you wrong, and those that can will understand the subtleties of
>HV, and not hassle you about it in the first place).
>
>
>
>
>
>Tesla list wrote:
> >
> > Original poster: "Stolz, Mark by way of Terry Fritz
><twftesla-at-qwest-dot-net>"
><Mark.Stolz-at-st-systems-dot-com>
> >
> > Hi All!
> >
> > I've been demonstrating my coil for some of my neighbors and inevitably
>the
> > question arises of how much voltage is in the leaders beig produced.  Is
> > there a ballpark number per foot?  This would sound much more intellignt
> > than saying "alot".
> >
> > I've heard that it's around 250KV per foot but I wanted confirmation
>before
> > using that number.
> >
> > Thanks,
> >
> > Mark Stolz
> > Houston, TX
>
>
>

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