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Re: Capacitor C/Peek

Tesla List wrote:
> 
> >From pierson-at-msd26.enet.dec-dot-comWed Oct 23 22:20:11 1996
> Date: Wed, 23 Oct 96 20:54:06 EDT
> From: pierson-at-msd26.enet.dec-dot-com
> To: mail11:  ;
> Cc: pierson-at-msd26.enet.dec-dot-com
> Subject: Capacitor C/Peek
> 
> I was pondering something exceedingly basic, and getting phunny numbers.
> Specifically, what energy is in the cap in the primary tank?
> 
> I keep getting a number which seems small, someone check my math:
> 
>         Joules == watt-seconds == (C(Ve2))/2
> 
> right?
> 
>         C= 0.025 uFd (for the CP caps, just to pick a number...
>         V=10,000 V (to pick another)
> 
> Rolling this together:
>         ((2.5)*(10e-8)*(10e4)e2))/2= 1.25 Joules
> 
> Izzat right?
> I was expecting a larger number....
> Am i dropping a decimal somewhere???



No, You are correct!  All Tesla coils tend to use caps in the .005-.1ufd 
range from 10 watts to 10,000 watts input and the most horrendous monster 
system is only poppin in about 10 joules of energy per pulse!  Kinda' 
whimpy when my water arc stuff hits a kilojoule on occasion.

It is the rep rate where the real energy delivery rate per second starts 
piling up.

A good no-brainer way to math out the joules in a weak skull (like mine) 
is to fixate on the kilovolts and square that kilo-number -- 15KV =225.  
lock in 225 in the old brain and only consider the  half the actual 
microfarad number. let's say...02 ufd is our cap.  This would be .01.  
Finally, multiply this half value of your cap,.01, times the 225 and you 
see we have 2.25 joules.

Richard Hull, TCBOR


> 
> ==============================
> As to Peeks' Tables and his book.  I have a copy (olde) of the book,  If anyone
> wants to figger out how to get it reprinted...  (HV Press?  That reprint shoppe
> in the midwest i can't think of the name of?)
> 
> HOWEVER, much of Peeks' results were reported in papers before the (then)
> AIEE (now IEEE), so a good library might have the relavant AIEE (IEEE)
> transactions.  Peek was studying lighting effects, so his work did extend up to
> 'coilish' frequencies.
> 
>         regards
>         dwp