More on Z=SQRT(L/C)

• To: tesla-at-pupman-dot-com
• Subject: More on Z=SQRT(L/C)
• From: Kennan C Herrick <kcha1-at-juno-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Tue, 14 Dec 1999 11:43:16 -0700
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

More beating on the (not quite dead) horse:  I'm still troubled by the
referenced expression.  That's an expression for the >characteristic
impedance< of certain electrical networks.  It doesn't seem to me that
that has a lot to do with the resonant network of a Tesla coil. 
Characteristic impedance, in ohms, is generally defined as the impedance
of a transmission line of infinite length; or else, the value of a
network's load resistance that causes the impedance looking into that
network to be the same as that load resistance.  Who knows what a load
"resistance" might be for a Tesla coil?

Malcolm Watts wrote that, for the lossless case at resonance, Z = Xl =
Xc...but shouldn't that be, Z = Xl - Xc?  Whether at resonance or no,
doesn't Z always = the vector sum of Xl and Xc (absent loss), that sum
being zero at resonance?

...And does it matter a whole heck of a lot when most of you guys (&
girls, I've noted) are clobbering your secondaries with all kinds of
messy shock-excitations from your 19th-cy.-style apparatuses?  (Speaking
as a solid-state-er, myself...ahem...)

Ken Herrick
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