Holy Moly -- Residual Electricity????

"Gordon" wrote in message
...
: "Androcles" wrote in message
: .uk...
:
: "Gordon" wrote in message
: ...
: : wrote in message
: : news : :
: : Capacitors.
: :
: :
: :
: : capacitors usually discharge when the current is switched off - their
: main
: : job is to smooth current, not to store volts....
:
: That shows how much you know -- which is zilch.
:
:
:
:
: Well rooty toot to you.

That shows just how childish you are.

"Androcles" wrote in message
o.uk...

"Gordon" wrote in message
...
: "Androcles" wrote in message
: .uk...
:
: "Gordon" wrote in message
: ...
: : wrote in message
: : news : :
: : Capacitors.
: :
: :
: :
: : capacitors usually discharge when the current is switched off -
their
: main
: : job is to smooth current, not to store volts....
:
: That shows how much you know -- which is zilch.
:
:
:
:
: Well rooty toot to you.

That shows just how childish you are.



Sod you you arrogant ignorant moron.
Capacitors ARE used to smooth current so just crawl back under your slimy
rock...

"Gordon" wrote in message
...
: "Androcles" wrote in message
: o.uk...
:
: "Gordon" wrote in message
: ...
: : "Androcles" wrote in message
: : .uk...
: :
: : "Gordon" wrote in message
: : ...
: : : wrote in message
: : : news : : :
: : : Capacitors.
: : :
: : :
: : :
: : : capacitors usually discharge when the current is switched off -
: their
: : main
: : : job is to smooth current, not to store volts....
: :
: : That shows how much you know -- which is zilch.
: :
: :
: :
: :
: : Well rooty toot to you.
:
: That shows just how childish you are.
:
:
:
: Sod you you arrogant ignorant moron.
: Capacitors ARE used to smooth current so just crawl back under your slimy
: rock...

That shows just how stupid you really are, you don't even know
the difference between voltage and current.
HAHAHA!

On Mon, 05 Nov 2007 20:35:17 GMT, wrote:

In sci.physics Prisoner at War wrote:

Is there some such concept as "residual electricity"???

There was a problem with a computer at work...it's a new Dell running
WinXP Pro...everything's fine, I go to lunch and come back to a blank
screen that won't wake up from power-save/sleep mode!! I do the
obvious and check connections, making sure they're secure and
whatnot. I turn off the computer and turn it back on a few times, to
no effect!

Tech Support suspects some kind of a "power management" issue --
whatever that is -- and suggests that I leave the system off for a few
minutes, literally, to let things "clear"...whatever that means. Sure
enough, however: it works!

So now I'm here asking, because Tech hasn't the time to puzzle over it
with me, WHAT HAPPENED??? And how come shutting off power for a few
seconds isn't comparable to leaving power off for a few
minutes????????????

TIA!

Capacitors.

Yes Capacitors which take a while to discharge.

On Nov 5, 12:27 pm, Lem wrote:
Gordon wrote:
wrote in message
news
Capacitors.

capacitors usually discharge when the current is switched off - their main
job is to smooth current, not to store volts....

True, but they don't discharge instantaneously. Ever hear about the
"time constant" of an R-C circuit?

T = R × C
whe
T = time constant in seconds
R = resistance in ohms
C = capacitance in farads

The time constant is the time taken for the charging (or discharging)
current (I) to fall to 1/e of its initial value (Io).

After each time constant the current falls by 1/e (about 1/3). After 5
time constants (5RC) the current has fallen to less than 1% of its
initial value and we can reasonably say that the capacitor is fully
(dis)charged, but in fact the capacitor takes for ever to (dis)charge
fully!

--
Lem -- MS-MVP - Networking

To the moon and back with 4KB of RAM and 72KB of ROM.http://en.wikipedia.org/wiki/Apollo_.../compessay.htm

Yes,To the moon and back with 4KB of RAM and 72KB of ROM.
So why can't some one harness nuclear fusion for our energy needs?

Prisoner at War wrote:
Is there some such concept as "residual electricity"???

There was a problem with a computer at work...it's a new Dell running
WinXP Pro...everything's fine, I go to lunch and come back to a blank
screen that won't wake up from power-save/sleep mode!! I do the
obvious and check connections, making sure they're secure and
whatnot. I turn off the computer and turn it back on a few times, to
no effect!

Tech Support suspects some kind of a "power management" issue --
whatever that is -- and suggests that I leave the system off for a few
minutes, literally, to let things "clear"...whatever that means. Sure
enough, however: it works!

So now I'm here asking, because Tech hasn't the time to puzzle over it
with me, WHAT HAPPENED??? And how come shutting off power for a few
seconds isn't comparable to leaving power off for a few
minutes????????????


You're going to get a lot of theory here, but the real answer is: The power
supply's broke.

"Gerald Newton" wrote in message
oups.com...
On Nov 5, 12:27 pm, Lem wrote:
Gordon wrote:
wrote in message
news
Capacitors.

capacitors usually discharge when the current is switched off - their
main
job is to smooth current, not to store volts....

True, but they don't discharge instantaneously. Ever hear about the
"time constant" of an R-C circuit?

T = R × C
whe
T = time constant in seconds
R = resistance in ohms
C = capacitance in farads

The time constant is the time taken for the charging (or discharging)
current (I) to fall to 1/e of its initial value (Io).

After each time constant the current falls by 1/e (about 1/3). After 5
time constants (5RC) the current has fallen to less than 1% of its
initial value and we can reasonably say that the capacitor is fully
(dis)charged, but in fact the capacitor takes for ever to (dis)charge
fully!

--
Lem -- MS-MVP - Networking

To the moon and back with 4KB of RAM and 72KB of
ROM.http://en.wikipedia.org/wiki/Apollo_.../compessay.htm

Yes,To the moon and back with 4KB of RAM and 72KB of ROM.
So why can't some one harness nuclear fusion for our energy needs?

1) Don't need to, your energy needs are really your energy wants.
Mankind can survive without the inefficient use of energy and has
done for millions of years, as do all other species on this planet.
There is a huge difference between need and want.

2) The equations are wrong, the fools are fiddling with Einstein's
relativity and it doesn't work.

So why can't *you* harness nuclear fusion for *my* energy wants?

No it's not!
"HeyBub" wrote in message
...
Prisoner at War wrote:
Is there some such concept as "residual electricity"???

There was a problem with a computer at work...it's a new Dell running
WinXP Pro...everything's fine, I go to lunch and come back to a blank
screen that won't wake up from power-save/sleep mode!! I do the
obvious and check connections, making sure they're secure and
whatnot. I turn off the computer and turn it back on a few times, to
no effect!

Tech Support suspects some kind of a "power management" issue --
whatever that is -- and suggests that I leave the system off for a few
minutes, literally, to let things "clear"...whatever that means. Sure
enough, however: it works!

So now I'm here asking, because Tech hasn't the time to puzzle over it
with me, WHAT HAPPENED??? And how come shutting off power for a few
seconds isn't comparable to leaving power off for a few
minutes????????????


You're going to get a lot of theory here, but the real answer is: The
power supply's broke.

Gordon wrote:
wrote in message
news
Capacitors.



capacitors usually discharge when the current is switched off - their main
job is to smooth current, not to store volts....

But it's not instantaneous, which can be seen easily by turning off your
computer, unplugging it from the wall/USP and pressing the computer's ON
switch. What you're doing is bleeding off the charge left behind by the
Instant On feature (keeps the mobo hot). This bleeds off pretty quickly
on its own.

IIRC I've seen big warning stickers on TVs/monitors warning of 1,000 of
volts if you go poking inside.

http://icrontic.com/forum/showthread.php?p=241556

In article .com,
says...

Is there some such concept as "residual electricity"???

There was a problem with a computer at work...it's a new Dell running
WinXP Pro...everything's fine, I go to lunch and come back to a blank
screen that won't wake up from power-save/sleep mode!! I do the
obvious and check connections, making sure they're secure and
whatnot. I turn off the computer and turn it back on a few times, to
no effect!

Tech Support suspects some kind of a "power management" issue --
whatever that is -- and suggests that I leave the system off for a few
minutes, literally, to let things "clear"...whatever that means. Sure
enough, however: it works!

So now I'm here asking, because Tech hasn't the time to puzzle over it
with me, WHAT HAPPENED??? And how come shutting off power for a few
seconds isn't comparable to leaving power off for a few
minutes????????????

The issue is with a cheap motherboard that doesn't properly recover from
Power Management settings.

Yes, capacitors have to be drained down over a couple minutes in some
cases, but they are not the symptom of the real problem - the real
problem is a crappy APM or motherboard.

--

Leythos
- Igitur qui desiderat pacem, praeparet bellum.
- Calling an illegal alien an "undocumented worker" is like calling a
drug dealer an "unlicensed pharmacist"
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