Re: cap firing voltage scope measurements question

• To: tesla-at-pupman-dot-com
• Subject: Re: cap firing voltage scope measurements question
• From: Bert Hickman <bert.hickman-at-aquila-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Tue, 22 Jun 1999 07:30:31 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Tesla List wrote:
> 
> Original Poster: FutureT-at-aol-dot-com
> 
> In a message dated 99-06-20 04:41:21 EDT, you write:
> 
> <<   John -
> 
>  >  It certainly is a mystery. To charge the cap to 840 watts (joules?) would
> > require 1680 watts input! With a 1000 watt input you have over unity
energy!
> > Or am I misreading your test?
> 
> >   John Couture >>
> 
> John,
> 
> I agree with Terry that there's no reason the cap charging should be
> limited to 50% efficiency.  This sounds like another coiling myth.  I
> believe the 840 cap-watts I'm seeing is about right for a 1kW input.
> I'm using a Weston lab type wattmeter for my power measurements.
> 
> The inductive kick mechanism suggested by Malcolm and Richie,
> and discussed by Terry, certainly appears in all ways to explain
> the voltage rise we are seeing.
> 
> John Freau

John(s) and all,

I agree with John Freau here. You'll see no more that 50% efficiency
when charging a capacitor from a voltage source through a resistor.
However, an inductive charging system can approach 100% efficiency since
the circuit consists of only reactive (i.e., lossless) elements. 

-- Bert --

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