[TCML] Copper wire resistance calculation ?
list at future-technologies.co.uk
Wed Sep 10 09:04:07 MDT 2008
----- Original Message -----
From: "jimlux" <jimlux at earthlink.net>
To: "Tesla Coil Mailing List" <tesla at pupman.com>
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
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 ?
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