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The very basics



Hi all coilers!

I'm looking for the very basics of the tesla coil theories... I hope you
can help me.
This is what I know: The first coil induces a current in the second
coil. Somehow the current in the second coil gets amplified, until the
voltage is so high that the coil discharges in the air, showing the cool
light effect... My questions are:
-Why do you need NST's?
-Why is the spark gap before the first coil?
-How is the current in the second coil amplified?
Could anybody tell me answers to this question or is there a paper about
it somewhere on the net?

Thanks, Reinier

BTW: I do know about inductance and some other basic electronic/magnetic
things...