Re: [TCML] Copper wire resistance calculation ?

["Chris Swinson" <list@xxxxxxxxxxxxxxxxxxxxxxxxx>]

----- Original Message ----- 
From: "jimlux" <jimlux@xxxxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Wednesday, September 10, 2008 2:36 PM
Subject: Re: [TCML] Copper wire resistance calculation ?


> Chris Swinson wrote:
> > I am trying to calculate from lengh, dia, in inches to resistance.
> >
> > I have
> >
> > Rho = 0.0000000174 / 39.3700787 ( resistance per inch)
> >
> > (4*WL*Rho)  /  (Math.sqrt(WD)*PI)
> >
> > WL=wire length in inches
> > WD = Wire dia in inches.
> >
> > Can't seem to get it to come out with any logical results. Could just be
> > how I set it out, or its convertion cross sectional area wrong or
> > something ?
>
> Don't you want the square of the diameter, not the square root?  i.e.
> you want length/area * rho


Ah!

Rho = 0.0000000174 / 39.3700787 // resistivity of copper is default per 
meter, convert to inches
area = WD*WD
RESULT = WL / area * Rho

I tried this in relation to the JavaTC demo coil, that gave 27ohms, though 
my figure comes out 0.015620142575432545 ?

chris


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