Calculating Sec. Voltage

• To: tesla-at-pupman-dot-com
• Subject: Calculating Sec. Voltage
• From: Rodney Graham Davies <Rodney.Davies-at-anu.edu.au>
• Date: Tue, 4 Feb 1997 01:34:29 +1100 (EST)
• Subscriber: Rodney.Davies-at-anu.edu.au Mon Feb 3 21:31:59 1997

Hi all,

Question: Wouldn't it be nice to know how many volts a TC will produce 
before it's actually built?

I'm searching for some formulas that may give results close to actual 
values, when calculating the secondary's output voltage.

For now, I've been using a silly little formula I retrieved from my old 
high school physics book which is an ideal (I mean for an "ideal" 
xformer) equation -

Vs   Vp   Ip
-- = -- = --
Ns   Np   Is

(I think the 3rd part is the right way up)...
Anyway,
Vs - Voltage of the secondary
Vp - Voltage of the primary
Ns - Number of turns of the secondary
Np - Number of turns of the primary

Rearranging -

Vs = Ns x Vp
     -------
       Np

To calculate the secondary voltage.

Now, I've applied this formula to a known coil (Yup, the Super Model 9 
from Bill Wysock, yet again...fine coil system too I might add!)..

Ok, specs -
Ns = 800
Np = 4.5
Vp = 20,000v

So, Vs = 800 x 20000
	 -----------
 	     4.5
        = 3,555,555.556 volts

The coil is actually noted in the gallery (Questacon Nat. Sci. & Tech. 
Centre, Canberra) as being a 3.5 MV coil...
 Although, most of the time it's only running on about 103v on the 
primary of the xformer as apposed to 250v.

Well, this formula is a little too "easy" so to speak, so does anyone 
have any formulas, preferably of the "hairy" type which one could use for 
this problem?

Thanks All,

Have fun..
Rod

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