Watts o' Problems

To: tesla-at-pupman-dot-com
Subject: Watts o' Problems
From: "Dan Kunkel" <dankunkel-at-hotmail-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
Date: Sat, 29 Apr 2000 19:55:19 -0600
Approved: twftesla-at-uswest-dot-net
Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hey all,

I recently completed my first coil. I use two 9000 volt 30 ma NSTs wired in 
parallel. By Ohm's law concluded that 9000*.03=270 watts for each 
transformer. But according to the factory spec plate, it is only producing 
145 watts. It states 120v in -at- 2.3 amps, 9000v out -at- 30ma, and 145 watts. 
The best answer I can give is that those figures are peak values and not 
RMS. But if you compute the RMS values...(.707*9000)*(.707*.03)=135 watts. 
So can anyone tell me what going on here? If it matters the plate also says: 
power correction-normal (I guess that means no capacitor to keep voltage and 
current in phase) and they are Transco brand.

I also have heard that it is best to impedance match your capacitor to your 
transformer's secondary impedance. So should you match your cap to the peak 
values or RMS values of your transformer? I would like to know this because 
I am about to trade in my mediocre saltwater units for a homemade poly cap. 
Should I use the computed .0177 uf (for 9000 volts -at- 30 mA) or should I 
build one with a smaller capaitance (for the apparent 145 watts output)?

Thanks for any advice in advance,

Dan

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