Re: inductance calculations (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: List moderator <mod1@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Mon, 21 May 2007 21:39:40 -0300
From: Antonio Carlos M. de Queiroz <acmdq@xxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: inductance calculations (fwd)

Tesla list wrote:
> Original poster: List moderator <mod1@xxxxxxxxxx>
>
>
>
> ---------- Forwarded message ----------
> Date: Mon, 21 May 2007 15:34:58 EDT
> From: Mddeming@xxxxxxx
> To: tesla@xxxxxxxxxx
> Subject: Re: inductance calculations (fwd)
>
>  
> Hi Wyatt, Ron, All,
>  
> IF you are old enough, or have done enough research, there IS a direct  
> conversion, as used in early electrical work. Tesla used these terms in CSN and  in 
> many of his patents. 
>  
> AS USED BY TESLA: 1 cm of inductance is 1 nH of inductance. 
> AS USED BY TESLA: 1 cm of capacitance is 1.111... pF of capacitance
>  
> The derivation for this is, I believe, somewhere  in  the list archive
>   
I probably posted something about this. The inductance of a straight 
wire is around 1 nH per millimeter (not cm), or
1 uH/m (the first value exact for  a 1 mm wire with ~0.01 mm of 
diameter, the last value exact for a 1 m wire with ~1.3 cm of diameter).
Long, thin wires have more inductance. Short, thick wires have less.
The capacitance of a sphere (or practically any shape with similar size) 
far from other objects is 1.11265 pF/cm of radius.

Antonio Carlos M. de Queiroz