Re: [TCML] charging reactors - Inductance formulas: maximum values

[Bert Hickman <bert.hickman@xxxxxxxxxx>]

Hi Phil,

In the CGS system of units, charge is defined in electrostatic units 
(ESU), and potential as ESU/cm, so the ratio of charge/potential (or 
capacitance) has units of cm(!). Similarly when measuring inductance in 
electromagnetic units (EMU), inductance also has units of cm. Because 
Tesla usually uses centimeters to describe inductance and capacitance, 
this can be quite confusing to those of us who are used to pF and uH. 
However, we can convert between systems of units via the following 
conversion:

In the SI system, capacitance is Coulombs/Volt, in units of Farads.

(ESU - statfarad) 1 cm <=> 1.11265 e-12 Farads ~ 1.113 pF
(EMU - abhenry)   1 cm <=> 1 e-9 Henry = 1 nH

ESU and EMU units have for the most part been phased out of common 
usage, and most folks now use SI or MKS units.

Bert

FIFTYGUY@xxxxxxx wrote:
>  
>  
> In a message dated 3/9/09 9:51:44 A.M. Eastern Standard Time,  
> stephenhiscock@xxxxxxxxx writes:
>
> > BTW  a sphere of 1cm also has a capacitance of 1cm.
>
>     Eh?
>  
> -Phil LaBudde
>
> Center for the Advanced Study of Ballistic  Improbabilities
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