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*To*: tesla-at-pupman-dot-com*Subject*: Re: VA and stored energy in capacitors*From*: "Tesla list" <tesla-at-pupman-dot-com>*Date*: Thu, 30 May 2002 17:30:12 -0600*Resent-Date*: Thu, 30 May 2002 17:42:34 -0600*Resent-From*: tesla-at-pupman-dot-com*Resent-Message-ID*: <plhd-.A.uZD.njr98-at-poodle>*Resent-Sender*: tesla-request-at-pupman-dot-com

Original poster: "Jolyon Vater Cox by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jolyon-at-vatercox.freeserve.co.uk> Sorry if original text was confusing -my email does not apparently support Greek symbols. "VA" is the apparent power of the capacitor in volt-amperes, "p" should have been "pi" (3.1416), "F" is the frequency in Hertz and "E" the energy stored in the capacitor in Joules. The equation VA =4 pi FE relates power to stored energy in a capacitor in an AC circuit. Other associated equations relate energy to power (E =0.5CV^2 = VA/(4 pi F)) and frequency to power,(F = VA/(4 pi E)). In hindsight, I realise these may not be appropriate to the current context. So is power in a TC primary cap in fact given by equation VA=2FE, which is the same as VA= FCV^2? ----- Original Message ----- From: "Tesla list" <tesla-at-pupman-dot-com> To: <tesla-at-pupman-dot-com> Sent: Thursday, May 30, 2002 3:00 PM Subject: Re: VA and stored energy in capacitors > Original poster: "harvey norris by way of Terry Fritz <twftesla-at-qwest-dot-net>" <harvich-at-yahoo-dot-com> > > > --- Tesla list <tesla-at-pupman-dot-com> wrote: > > Original poster: "Jolyon Vater Cox by way of Terry > > Fritz <twftesla-at-qwest-dot-net>" > > <jolyon-at-vatercox.freeserve.co.uk> > > > > > > Since relationship between apparent power (VA), > > frequency (F) and stored energy > > (E) in a capacitor in an AC circuit is VA=4pFE, > What does the 4p indicate? Dont know about the > complications involved with an arc gap as you are > asking, but I am confused here on your initial > assessment. The cap energy storage is noted as .5CV^2, > which tranfers twice per cycle, meaning that for 60 > hz, a 120 fold multiplication should give the energy > transfer. Is your 4pF= 120? (for 60 hz) > > where it is assumed that F is > > the line frequency (50 to 60 Hz) during the period > > when the capacitor is being > > charged by the transformer prior to the firing of > > the spark-gap, doesn't the > > same equation apply when the gap fires when F > > becomes the resonant frequency of > > the Tesla coil primary? > > > > Does this not go some way into accounting for high > > peak powers observed in TC > > discharges? > > > > > > > > >

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