Re: Power output

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "davep by way of Terry Fritz <twftesla-at-qwest-dot-net>" <davep-at-quik-dot-com>

Tesla list wrote:
 
> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
><jim-at-jlproduction-dot-com>
 
> Hi again,

> I was wondering if someone could briefly explain the method of working
> out power output for my coil.

	A non trivial exercise.  Many losses and tricky waveforms.

> If I’m not mistaken a transformer's output

	voltage

> is a ratio related to input

	voltage

> and number of turns correct?

	For voltage.  For non resonant (non tesla) transformers.
	And little to do with _power_ which was the question.

> I used Tesla CAD to figure out the frequency of the coil but I see
> many people referring to watts and voltage so I was wondering how
>to determine this.

	OUTPUT watts, in a Tesla system are Serious Challenge.
	Input watts are gotten from transformer specs, or
	better from measurement, as the waveforms are complex
	(again) and the phase of the input current may not match the
	input voltage (cf Power Factor.)

> Quick specs are:
> Power-9KV/30MA NST
> Primary-12 turns of 1/4 soft copper at 1/4 spacing
> Secondary-850 turns of #22 magnet wire on a 4 in. I.D. form
> HV cap-15K/.01mfd commercial cap(Condenser products)

	Input Ballast, if any?

	9kv * 30 mA gives 270 VA as a starting point...

	Not uncommonly coils are run 'overpowered' as they are not
	on for long periods of time.  (except when they are...
	In which case, respecting the ratings helps preserve the
	transformer, etc...)

	best
	dwp