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*To*: tesla-at-pupman-dot-com*Subject*: RE: New Inductance Formula*From*: "Tesla list" <tesla-at-pupman-dot-com>*Date*: Fri, 03 May 2002 10:47:15 -0600*Resent-Date*: Fri, 3 May 2002 10:49:02 -0600*Resent-From*: tesla-at-pupman-dot-com*Resent-Message-ID*: <NlaAP.A.0S.W9r08-at-poodle>*Resent-Sender*: tesla-request-at-pupman-dot-com

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <biomed-at-miseri.winnipeg.mb.ca> Subject: RE: New Inductance Formula Original poster: "Jan Wagner by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jwagner-at-cc.hut.fi> Hi Jan, Dave, and the list, I've modified and tested this one for all metric units. 1.55*10^-3 * (N*R)^2 * kg * m L = ------------------------------- [(354.3*R)+(393.7*H)] * coul^2 (R and H in _metres_, N is unitless) Obviously it's more complicated that the original, a person could round off some of the multiplication factors, like Jan had done to make it look more ...nice, and easier to use. I've left then as they worked out to be, this way to keep it accurate. contra > >> (N*R)^2 * 10^-6 * kg * m > >> henry = ------------------------ > >> [(9*R)+(10*H)] * coul^2 > >> The units N, R, and H are still in inches. > >Because a Henry is defined as m^2 kg / Coul^2 and Coul=s*A Also Henries are measured in Webers per Ampere which is Magnetic flux per ampere, Which is also equal to Volt econds per ampere. Also What Dave derived and another version too. See below. Wb V * Sec Kg * m^2 Kg * m^2 L = ------- = -------------- = ----------------- = ------------------------ = Henries Amp Amp Coul^2 Amp^2 * Sec^2 These units I obtained from a physics text and Circuit analysis book. I have a question about Wheelers formula, In Modern Resonance Transformer Design Theory, a 1985 version, it uses in the demoninator [8*a + 11*b] instead of 9 and 10, is this an older version of the equation or slightly different application? This discussion got to me so I had to look it up. Shaun Epp

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