Re: Residual charge left on caps

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: Matthew Smith <matt-at-kbc-dot-net.au> 

Tesla list wrote:
>Original poster: "Hydrogen18" <hydrogen18-at-hydrogen18-dot-com>
>Is it possible to store energy in this way for long periods of time?
>Assuming the the dielectric is kept well insulated from any potentional
>conductors?

You can certainly set up a charge on a dielectricic material (PTFE seems to 
be one of the current favourites) in an electrical analogue to a 
magnet.  This is what is called an electret.  You might want to have a look 
at the HV list (sister list to this one), where there has been an electret 
thread (I know, I started it!) within the last week.  It's something that 
is achievable with "normal household materials" - provided that your 
household has a direct current HV supply ;-)

I find the subject fascinating but it's probably a bit off-topic for this 
list.  The HV list has quite a few members in common with this one.  For 
some reason, I can't find a mention of it at <http://www.pupman-dot-com>, 
although you should be able to find reference to it by searching the 
archives of this list.

Cheers

M

-- 
Matthew Smith
Kadina Business Consultancy
South Australia
http://www.kbc-dot-net.au