Re: capacitor

• To: tesla-at-pupman-dot-com
• Subject: Re: capacitor
• From: Parpp807-at-aol-dot-com (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Sun, 02 Jan 2000 18:33:21 -0700
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

In a message dated 1/2/00 6:04:32 PM Central Standard Time, tesla-at-pupman-dot-com 
writes:

<< I've got two 0,5 m^2 copper plates and window glas in between (0,4cm =
 4mm). How big is this cap?
  >>
Hi Thomas,

The classical formula for capacitance is

C = kA / d
use SI units
C is in Farads
k is the dielectric constant. 
A is the area in sq meters
d is the distance between the plates

Tables of dielectric constants and dielectric strength for many materials can 
be found in any EE or physics text. Glass is many things but a typical k for 
glass is 8.
CAUTION: most glass contains impurities; it is not safe for high voltages.
I have played with it where only fools would venture. Be careful. It can send 
shrapnel around the room like a grenade.

Happy day,
Ralph Zekelman

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