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Is 0.5*C*V*V vaild? (Was Output Voltages and Voltage/Length)


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From:  John H. Couture [SMTP:couturejh-at-worldnet.att-dot-net]
Sent:  Wednesday, February 11, 1998 5:56 PM
To:  Tesla List
Subject:  Re: Is 0.5*C*V*V vaild?  (Was Output Voltages and  Voltage/Length)


  Jim, Greg -

  You did not mention input energy. If you are saying that increasing the
number of breaks will increase the spark length without increasing the input
energy you are getting into the realm of over unity energy gain. An
increasing spark length can indicate more energy consumed by the load
requiring more input energy if there are no other changes.

  Note that the voltage can be increased at the toroid by reducing the "dt"
conditions with no other changes. However, this cannot be done with the
energy at the toroid. I agree that "its all in the timing". By reducing the
"dt" the voltage at the toroid can be increased because of the equation
  
     VA = Watts = joules/dt  

  The quantity of electricity (coulombs) on the toroid is    

   Q = A dt

  It is obvious there is a limit on the "dt" because the time must be
sufficient to charge the toroid to the proper voltage.

  I agree a path of ionized air helps with the spark length but I do not
agree that the voltage on the toroid has nothing to do with the extended
length of the spark. If this was correct the spark length could be increased
beyond limit with the same voltage on the toroid. 

  The breakout is not dependent on the C. It is dependent on the radius of
curvature and roughness of the toroid surface and the surrounding environment.

  John Couture

-------------------------------------------------------- 


At 08:59 PM 2/8/98 -0600, you wrote:
>
>----------
>From:  Greg Leyh [SMTP:lod-at-pacbell-dot-net]
>Sent:  Saturday, February 07, 1998 12:14 PM
>To:  Tesla List
>Subject:  Re: Is 0.5*C*V*V vaild?  (Was Output Voltages and Voltage/Length)
>
>jim heagy wrote:
>
>>      2
>> .5CV     applies to the energy stored in the torroid of the tesla coil. The
>> whole idea of a 1/4 wave coil is to have the maximum amount of energy
>> transferred from pri. to sec. to the capacitor on top of the coil (torroid)
>> and then to have the energy released as a large arc. C has to be small enough
>> that V will get big enough to "break out" But to get the best effect, C
has to
>> be big enough that V doesn't get high enough to cause "break out" before most
>> of the system's energy has been transferred to the torriod. At this time of
>> the first breakout the torroid has reached the highest voltage that it will
>> ever attain. All subsequent breakouts will occur at lower voltages because
>> "break out" occurs more easily {lower voltage} when there is ionized air
>> around the torroid. The further "break outs" extend the length of the spark
>> faster than the eye can see to give it the spectacular look that we all
strive
>> to attain, but this extended length has NOTHING to do with how much voltage
>> created the spark. As the old saying goes "its all in the timing".  I hope I
>> got this right.
>
>In general, that's pretty much my understanding at present;
>However, I find that my models of TC operation are still in 
>a state of 'flux'.
>
>
>-GL
>
>
>