Super Capacitor
Hi,
What is super capacitor ?
Thank You
Mohamed Refky
_________________________________________________________________
Send and receive Hotmail on your mobile device: http://mobile.msn.com
What is super capacitor ?
Thank You
Mohamed Refky
_________________________________________________________________
Send and receive Hotmail on your mobile device: http://mobile.msn.com
Comments
its capacitance is specified in Farads and is typically used to
maintain electronic circuits energized for long periods of time.
They are low voltage devices in the range of 5 volts.
The major problem is the large internal resistance (Equivalent Series
Resistance, ESR for short) that makes those devices a low current
device (micro amps).
the approximate discharge time of capacitor (Super Caps included) is:
t=C*I/Vc
where t in seconds, C in Farads, I in amperes, Vc is the fully
charges voltage.
The equivalent capacitor voltage (Vc) is a open load voltage source
(Vo) in series with a internal resistance Resr
(Thevenin's equivalent circuit)
Resr
|----/\/\/\----
[noparse][[/noparse]O] Vo Vc
|
--- In basicstamps@y..., "Mohamed REFKY" <refky@h...> wrote:
> Hi,
> What is super capacitor ?
>
> Thank You
> Mohamed Refky
>
>
>
> _________________________________________________________________
> Send and receive Hotmail on your mobile device:
http://mobile.msn.com
memory and clock-calendar circuits, etc... Also used in some of the BEAM
robot stuff I believe.
Original Message
> What is super capacitor ?
because,
Q=C*V=I*t where Q is total charge in Coulombs.
Regards,
Ray McArthur
Original Message
From: acatano2002 <acatano2002@y...>
> the approximate discharge time of capacitor (Super Caps included) is:
>
> t=C*I/Vc
>
> where t in seconds, C in Farads, I in amperes, Vc is the fully
> charges voltage.
you do is lie in wait to correct people's mistakes?
Original Message
> Don't you mean t=CV/I ?
> because,
> Q=C*V=I*t where Q is total charge in Coulombs.
> > the approximate discharge time of capacitor (Super Caps included) is:
> >
> > t=C*I/Vc
> >
> > where t in seconds, C in Farads, I in amperes, Vc is the fully
> > charges voltage.
--- In basicstamps@y..., "Ray McArthur" <rjmca@u...> wrote:
> Don't you mean t=CV/I ?
> because,
> Q=C*V=I*t where Q is total charge in Coulombs.
>
> Regards,
> Ray McArthur
>
>
Original Message
> From: acatano2002 <acatano2002@y...>
> > the approximate discharge time of capacitor (Super Caps included)
is:
> >
> > t=C*I/Vc
> >
> > where t in seconds, C in Farads, I in amperes, Vc is the fully
> > charges voltage.
for these groups is:
"share knowledge between beginners and experts"
--- In basicstamps@y..., Rodent <daweasel@s...> wrote:
> Why is it you folks are never around to answer questions? It seems
to me all
> you do is lie in wait to correct people's mistakes?
>
>
Original Message
>
>
> > Don't you mean t=CV/I ?
> > because,
> > Q=C*V=I*t where Q is total charge in Coulombs.
>
> > > the approximate discharge time of capacitor (Super Caps
included) is:
> > >
> > > t=C*I/Vc
> > >
> > > where t in seconds, C in Farads, I in amperes, Vc is the fully
> > > charges voltage.
seem to pop up when someone makes an error, and then only to show off what
skills they have. Trust me, real experts don't do this.
Original Message
> We accept your point of view. However I understand that the reason
> for these groups is:
> "share knowledge between beginners and experts"
> > Why is it you folks are never around to answer questions? It seems
> to me all
> > you do is lie in wait to correct people's mistakes?
what's the point of providing another answer? There is no harm in lurking,
and if somebody offers an incorrect mathematical formula, it's far better
for the lurker to jump in and correct it than to let it slide. Not everybody
has time to answer every question that a large percentage of us has the
capability of answering. Thank goodness, too--I personally find it annoying
to get a dozen identical answers to a simple question. I end up deleting so
many unread messages that I often miss these tangential threads...
Cliff
Original Message
From: "Rodent" <daweasel@s...>
To: <basicstamps@yahoogroups.com>
Sent: Tuesday, December 25, 2001 8:25 PM
Subject: Re: [noparse][[/noparse]basicstamps] Re: Super Capacitor
Thats fine if these folks contribute on a regular basis. However, they only
seem to pop up when someone makes an error, and then only to show off what
skills they have. Trust me, real experts don't do this.
Original Message
> We accept your point of view. However I understand that the reason
> for these groups is:
> "share knowledge between beginners and experts"
> > Why is it you folks are never around to answer questions? It seems
> to me all
> > you do is lie in wait to correct people's mistakes?
To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
and be thankful that some one cared enough to point out errant thinking or
give another point of view for consideration. Welcome the new input as help
and not a criticism.
Original Message
From: "Rodent" <daweasel@s...>
To: <basicstamps@yahoogroups.com>
Sent: Tuesday, December 25, 2001 8:25 PM
Subject: Re: [noparse][[/noparse]basicstamps] Re: Super Capacitor
> Thats fine if these folks contribute on a regular basis. However, they
only
> seem to pop up when someone makes an error, and then only to show off what
> skills they have. Trust me, real experts don't do this.
>
>
Original Message
>
> > We accept your point of view. However I understand that the reason
> > for these groups is:
> > "share knowledge between beginners and experts"
>
> > > Why is it you folks are never around to answer questions? It seems
> > to me all
> > > you do is lie in wait to correct people's mistakes?
>
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
I agree 100%, especially if one is in another time zone.
Regards
ECO
Original Message
From: "Cliff Griffin" <cliff@g...>
To: <basicstamps@yahoogroups.com>
Sent: Wednesday, December 26, 2001 6:11 AM
Subject: Re: [noparse][[/noparse]basicstamps] Re: Super Capacitor
>
> If somebody checks their email AFTER an answer has already been given,
> what's the point of providing another answer?
>From: "acatano2002" <acatano2002@y...>
>Reply-To: basicstamps@yahoogroups.com
>To: basicstamps@yahoogroups.com
>Subject: [noparse][[/noparse]basicstamps] Re: Super Capacitor
>Date: Tue, 25 Dec 2001 17:03:10 -0000
>
>Super Capacitors are energy storage devices.
>its capacitance is specified in Farads and is typically used to
>maintain electronic circuits energized for long periods of time.
>They are low voltage devices in the range of 5 volts.
>The major problem is the large internal resistance (Equivalent Series
>Resistance, ESR for short) that makes those devices a low current
>device (micro amps).
>the approximate discharge time of capacitor (Super Caps included) is:
>
> t=C*I/Vc
>
>where t in seconds, C in Farads, I in amperes, Vc is the fully
>charges voltage.
>The equivalent capacitor voltage (Vc) is a open load voltage source
>(Vo) in series with a internal resistance Resr
>(Thevenin's equivalent circuit)
>
> Resr
> |----/\/\/\----
> [noparse][[/noparse]O] Vo Vc
> |
>
>
>
>--- In basicstamps@y..., "Mohamed REFKY" <refky@h...> wrote:
> > Hi,
> > What is super capacitor ?
> >
> > Thank You
> > Mohamed Refky
> >
> >
> >
> > _________________________________________________________________
> > Send and receive Hotmail on your mobile device:
>http://mobile.msn.com
>
>
>To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
>from the same email address that you subscribed. Text in the Subject and
>Body of the message will be ignored.
>
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
_________________________________________________________________
Send and receive Hotmail on your mobile device: http://mobile.msn.com