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FW: Hi Q Quest (was sync TC latest resul
From: Benson_Barry%PAX5-at-mr.nawcad.navy.mil[SMTP:Benson_Barry%PAX5-at-mr.nawcad.navy.mil]
Sent: Monday, November 24, 1997 8:00 PM
To: tesla-at-pupman-dot-com
Subject: Re: Hi Q Quest (was sync TC latest resul
Hi Greg, All,
I agree that the energy = 1/2 X C X V^2 for a fixed capacitance
will not change with frequency. The ionization of the air becomes more
efficient at higher frequencies (1). The increased ionization causes the
conductivity to increase which has the net effect of increasing the terminal
capacitance. As capacitance increases the energy required to attain the
samevoltage increases. With the larger capacitance the capacitance
reactancedecreases. The resonant frequency down shifts. Would this not
imply that it takes more energy to get shorter sparks at higher frequencies?
(1) Radio Frequency Capacitor Discharges-Raizer et. all.
Barry
From: Greg Leyh[SMTP:lod-at-pacbell-dot-net]
Sent: Saturday, November 15, 1997 3:49 AM
To: Tesla List
Subject: Re: Hi Q Quest (was sync TC latest resul
Benson_Barry wrote:
> I wonder about something. The toroid has
> isotropic capacity. Since Xc = 1/(2 * pi * f * C) the toroid
> could be viewed as a reactive load that gets bigger as
> frequency gets higher. In other words it would require
> more energy to charge the toroid to a given voltage as
> the frequency increased. If you had a 100 kHz coil and
> a 200 kHz coil with the same size toroid then the 200 kHz
> coil would require more energy to get the same spark length
> at the same break rate to obey the law of conservation of energy.
[snip]
Actually, the energy would remain the same (E = 1/2 CV^2).
Only the _reactive_ power in the secondary (kVAR's = V^2/Xc)
would increase at the higher frequency.
-GL