[sdiy] 60 Farad capacitors from Korea

[Harry Bissell Jr]

> From: "James Petts" <jpetts at gmail.com>
> To: <synth-diy at dropmix.xs4all.nl>
> Sent: Tuesday, February 22, 2005 9:26 PM
> Subject: Re: [sdiy] 60 Farad capacitors from Korea
> 
> 
> > BTW, forgot to mention that a coulomb is the
> amouunt of charge carried
> > by 1 amp flowing for 1 second, or about 6.24×10^18
> electron charges.
> > Note that this is *not* Avogardro's number of
> electrons:

woah.  Avogadro's number is 6.02x10^23 ... so any
confusion would probably be from someone recognizing
the number 'six' and ignoring the exponent :^P

Today's Sesame Street is brought to you by the
number 'six' (.02E23 :^)

H^) harry



 that quantity
> > of charge is called a faraday (not farad).
> >
> > Knew my electrochemistry PhD would come in handy
> some time...
> >
> >
> > On Tue, 22 Feb 2005 21:09:25 -0800, James Petts
> <jpetts at gmail.com> wrote:
> >> A farad is the capacitance of a condenser with
> one electrode having 1
> >> coulomb of charge, the other -1 coulomb, with a
> potential difference
> >> of 1V between the plates.
> >>
> >>
> >> On Tue, 22 Feb 2005 23:41:47 -0500, anthony
> <aankrom at bluemarble.net> 
> >> wrote:
> >> >
> >> >
> >> > >I tried unsoldering a couple of 2 farad caps
> from a video recorder, 
> >> > >and
> >> > > every time my soldering iron touched the
> solder joint I got a dirty 
> >> > > great
> >> > > spark. Investigation proved that it was not
> electrical (no return 
> >> > > path to
> >> > > start with, and the spark was orange). Turns
> out these buggers had 
> >> > > leaked
> >> > > and the electrolyte was explosive. Heat it
> and it goes bang!
> >> >
> >> > Wacky.
> >> > Do you know what it was? If I recall correctly
> these caps aren't
> >> > electrolytic even. Some sort of carbon
> material. Their ESR probably 
> >> > sucks
> >> > ass, but for what you'd use them for that
> wouldn't matter at all.
> >> >
> >> > OT (sort of) Question to (electro-)chemists out
> there:
> >> > Is a Farad equal to the number of electrons
> that would correspond to 
> >> > one
> >> > Mole of hydrogen (protons)?
> >> > Like a quantity of electrons equal to
> Avogadro's number (which is a big
> >> > number).
> >> >
> >> > If so then 60 Farads would be able to
> electrolyse 15 moles of hydrogen
> >> > (gas - H2) which given hydrogen's molar gas
> volume of 25L, would be 
> >> > 375L of
> >> > hydrogen gas at atmospheric pressure. (Sorry I
> had a college flashback)
> >> >
> >> > > Ken
> >> > >
> >> >
> >> >
> >>
> > 
> 
>