Re: TC knowledge

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "rheidlebaugh by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rheidlebaugh-at-zialink-dot-com>

What you have said is correct. I stated a simple ideal view of a coil.
Losses are a real life factor, but what point of your explanation is of any
value to a child wanting to know why a TC works.
   Robert  H 

> From: "Tesla list" <tesla-at-pupman-dot-com>
> Date: Tue, 08 Jan 2002 17:24:57 -0700
> To: tesla-at-pupman-dot-com
> Subject: Re: TC knowledge
> Resent-From: tesla-at-pupman-dot-com
> Resent-Date: Tue, 8 Jan 2002 17:46:42 -0700
> 
> Original poster: "Finn Hammer by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <f-hammer-at-post5.tele.dk>
> 
> Robert, all!
> 
> While it is true that a tesla coil is a transformer, it is not true that
> it responds in a turns ratio fasion, when operating in disruptive mode.
> Loose coupled coils take time to transfer the energy from one coil to
> the other, and the amount of oscillations that it takes to transfer the
> energy is determined by the coupling factor. With the coupling factors
> that are typically involved in tesla coiling (0.1-0.2) it takes from
> 8-16 cycles to make a full transfer from primary to secondary.
> With regard to top voltage, this is a question of how much energy that
> ends up in the toroid.
> Let`s say that the primary capacitor is 50nF and that it is charged to
> 20kV at the time where the sparkgap breaks down and starts conducting.
> It then holds a charge of Epri=(Vpri^2)*Cpri/2 =
> 20000*20000*0.0000005/2=10joule.
> When this charge is transferred to the top terminal, the resulting
> voltage is:
> Vtop=sqrt(2*Epri/Ctop) For a top capacity of, say, 40 Pico Farads the
> max. voltage will be:707106 volts.
> 
> This is not an impossible value, provided that the secondary coil is
> long enough to hold off the voltage, the toroid is smooth enough, and
> has a minor diametre large enough to prevent breakout at less than
> that,and assuming a lossless gap. (and ignoring coil self capacitance)
> 
> Let`s not get carried away with unrealistic claims of multi million
> volts on the top terminal, only a few coils exceed 1 million volts.
> 
> Cheers, Finn Hammer
> 
> Tesla list wrote:
>> 
>> Original poster: "rheidlebaugh by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <rheidlebaugh-at-zialink-dot-com>
>> 
>> A TC is a special transformer. In a transformer when you put a voltage in
>> the primary the voltage will be the same out as the ratio of turns. If you
>> have 10 turns in the primary and 100 turns in the secondary the output
>> voltage will be 10 times larger. Most TC coils have about 1: 100 turns. The
>> voltage in is about 20'000v so the output can be 2,000,000V. No this is not
>> all, but it is a over view of how it works. My small class room TC starts
>> with 100V and puts out 10,000V.
>> Robert  H
>> 
> 
> 
>