RE: Parallel and Series LCR Circuit Qs

["Malcolm Watts" <M.J.Watts-at-massey.ac.nz> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

On 22 Aug 00, at 18:05, Tesla list wrote:

> Original poster: "John H. Couture" <couturejh-at-worldnet.att-dot-net> 
> 
> 
> All -
> 
> This could be misleading. Every generator in a power station has a voltage
> regulating characteristic that limits its ability to furnish a certain
> amount of current without excessive voltage drop. If the power station is a
> small one with a small generator like many of the early rural hydro plants
> the current load will be very limited because of the generator inpedance. In
> some cases it will be impossible to operate a large electric welder or Tesla
> coil? without causing the neighbors lights to flicker.
> 
> John Couture

OK - so everything in the real world has an internal 
impedance. I agree. It's significance depends on the degree of 
loading. Fair enough.

Regards,
Malcolm

> 
> --------------------------
> 
> 
> 
> -----Original Message-----
> From: Tesla list [mailto:tesla-at-pupman-dot-com]
> Sent: Monday, August 21, 2000 5:36 PM
> To: tesla-at-pupman-dot-com
> Subject: Re: Parallel and Series LCR Circuit Qs
> 
> 
> Original poster: "Malcolm Watts" <M.J.Watts-at-massey.ac.nz>
> 
> Hi Gavin,
> 
> On 21 Aug 00, at 6:49, Tesla list wrote:
> 
> > Original poster: ghub005-at-xtra.co.nz
> >
> > > Original poster: "Richard Kircher" <richard.kircher-at-worldnet.att-dot-net>
> >
> > <snip>
> >
> > >  Most confusing to me is impedance matching to the load/streamer.
> > >  Some
> > > folks think that the most power transfer occurs when the source
> > > impedance is matched to the load impedance.  Don't try that idea with
> > > your car battery.  The most power transfer occurs when the source
> > > impedance is ZERO ohms and this applies to all lumped component
> > > circuits.  Of course, absolute zero is not achievable especially when
> > > the Cp/Cs ratio is high in the world of realizable coil parameters.
> > > Given that the streamer impedance can't be changed or matched, it
> > > would seem the only thing left to do is to make the coil output
> > > resistance as low as possible (high efficiency) and match the reactive
> > > component.
> >
> > Richard
> >
> > Surely a source impedance of zero ohms means that your power
> > source also has a zero output voltage? (Ohm's law)
> >
> > For maximum power transfer you will need to make the TC's output
> > impedance equal to the complex conjugate of the spark impedance
> > i.e. match the resistive componets and reverse the reactive
> > component. This will give you a theoretical maximum efficiency of
> > 50% (as at least half of the power will always dissipated in the
> > source impedance).
> >
> > Of course, the spark impedance probably isn't linear - so all this
> > may be moot. I would recommend that you just aim for the ballpark
> > and concentrate on reducing losses in the SG and primary etc etc.
> 
> Technically a voltage source has an internal impedance of zero
> ohms. By definition this means it can deliver any amount of
> current asked of it with no voltage drop at its terminals. A
> large lead-acid battery comes close to this definition as does
> a power station.
> 
> Regards,
> Malcolm
> <snip>
> 
> 
> 
> 
> 
>