[TCML] charging reactors - Inductance formulas: maximum values
bert.hickman at aquila.net
Tue Mar 10 07:04:42 MST 2009
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
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.
FIFTYGUY at aol.com wrote:
> In a message dated 3/9/09 9:51:44 A.M. Eastern Standard Time,
> stephenhiscock at yahoo.com writes:
>> BTW a sphere of 1cm also has a capacitance of 1cm.
> -Phil LaBudde
> Center for the Advanced Study of Ballistic Improbabilities
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