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Re: Parallel and Series LCR Circuit Qs



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>