# Re: How should we measure coil efficiency, was neon vs. potenti

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From: 	Greg Leyh[SMTP:lod-at-pacbell-dot-net]
Sent: 	Friday, August 01, 1997 3:42 PM
To: 	Tesla List
Subject: 	Re: How should we measure coil efficiency, was neon vs.    potenti

Tesla List wrote:

> >> >   Where did you find that higher frequency gives shorter sparks?  I believe
> >> > it is the other way around.  The higher the frequency the longer the spark.
> >> >
> >> >    Energy = hf    h = Planck's constant   f = freq.
> >> >
> >> >    From the above equation the energy increases as the frequency increases,
> >> > other factors being equal. This would mean when the frequency increases the
> >> > spark length increases.
> >> > -JHC
> >>
> >> Ha ha ha!  So my coil's energy = 6.626E-34 X 60 kHz =  3.975E-29 Joules!!!
> >> -GL
> >
> >Your coil doesn't look too promising, does it?  ;-)
> >
> >Actually, I don't think the equation quoted has a whole lot of relevance
> >to the discussion. Per my best recollection, this is a quantum physics
> >relation between the energy in a single photon and that photon's
> >frequency. So if your coil's output consists only of radiated energy
> >(that's photons) and only radiates them so rarely that you can distinguish
> >individual ones, then we may wish to consider it of use. Otherwise, we may
> >need to exercise some real creativity to apply it here.
> >
> >Actually plugging in a few numbers as you did can provide a useful sanity
> >check. Take care...
> >Wes B.
>
>   Greg forgot to multiply by the number of atoms involved. Planck's constant
> is atomic in nature and a fundamental constant in wave mechanics.
>
>   Tesla coils use oscillators which produce dampened waves. It appears from
> this energy equation that the energy would increase as the frequency of the
> waves increases, other factors being equal.
> -JHC

Actually, I believe that Wes is correct. E=hv only applies to quantum mechanics.

Otherwise, you will have to define _which_ atoms in the coil need to be
considered for finishing my computation!

-GL

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