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All things being the same (which they never are!), the system using a
transformer that delivers the most output power will deliver the longest
sparks. So, the 7 kV 100 mA transformer should be the winner. "Best
case" spark length appears to roughly scale as the square root of input
power to the system (per John Freau's formulas). One estimate (for a
synchronous spark gap):
L = 1.7*Sqrt(Power) (Synchronous spark gap at 100 or 120 BPS)
L = "best case" spark length (inches)
Power = face plate power (V x A)
Depending on how well the system is constructed and power level, typical
spark gap coils may achieve only 50-80% of the "best case" values above.
However, the power law still applies - more power generally translates
to longer sparks, as long as you don't overheat the spark gap
electrodes. Since spark gap cooling and spacing can be a bit more
challenging with higher-current, lower-voltage systems, the 10 kV 5 mA
transformer may be somewhat easier to use than the 7 kV transformer.
Pier Aisa wrote:
Dear Teslalovers Hi to everybody,
I have to choose between the two Transformers 7KV-100mA or 10KV-50mA.
What will be the best choice in order to obtain longer sparks ?
Thank you in advance
PS:Some details about my present 300VA TeslaCoilin on my youtube channel
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