Re: Spark type question

• To: "'Tesla List'" <tesla-at-poodle.pupman-dot-com>
• Subject: Re: Spark type question
• From: Tesla List <tesla-at-stic-dot-net>
• Date: Mon, 3 Nov 1997 22:29:39 -0600
• Approved: tesla-at-stic-dot-net

From: 	Julian Green[SMTP:julian-at-kbss.bt.co.uk]
Sent: 	Monday, November 03, 1997 8:26 AM
To: 	tesla-at-pupman-dot-com
Subject: 	Re: Spark type question

If you measure the current flowing in a capacitor as frequency rises so does 
the current.  (Zc = 2*Pi*F*C)

Air has capacitance, so as the frequency of your coil goes up the more 
significant the air capacitance becomes.  This is why a tesla coil can generate
sparks that terminate in thin air.   Low frequency tesla coils generate more
solid arcs with fewer wispy bits as the air capacitance is less significant.
At higher frequencys like 1MHz you get no streamers at all, just loads of corona,
it looks like a gas cooker flame.   A good middle ground is about 150KHz.

Julian Green

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