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Re: [TCML] Copper wire resistance calculation ?




----- 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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