Re: How should we measure coil efficiency, was neon vs. potenti
Sent: Saturday, July 26, 1997 4:29 AM
Subject: Re: How should we measure coil efficiency, was neon vs. potenti
> Where did you find that higher frequency gives shorter sparks? I believe
> it is the other way around. The higher the frequency the longer the spark.
> Energy = hf h = Planck's constant f = freq.
> From the above equation the energy increases as the frequency increases,
> other factors being equal. This would mean when the frequency increases the
> spark length increases.
The above equation completely ignores radiation losses, and plasma ion
growth effects. As you said, "other factors being equal", but in a TC other
factors are not equal. High frequency sparks tend to take on a short
plasma flame-like appearance.
> But frequency is a minor factor. The major cause of air ionization is
> voltage and the higher voltages give longer sparks.
> As I have said in past posts, the quality and appearance of sparks is
> subjective for Tesla coil ratings, so these ratings must be viewed from
> standpoint. Also, sparks cannot be converted to energy so they cannot be
> used for findung the efficiency of a Tesla coil.