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Current reversal in 2 connected car batteries?

A

Adrian

Jan 1, 1970
0
DervMan ([email protected]) gurgled happily, sounding much like they
were saying :
Only an arrogant Brit think that it's "their" language and should deem
who can or cannot say it, eh?

Strikes me there's a clue in the name...
 
A

Adrian

Jan 1, 1970
0
([email protected]) gurgled happily, sounding much like they were
saying :
That's OK. Most Americans find this sort of self-superiority
somewhere between amusing and irritating--and very French.

Unless, of course, it's self-superiority _by_ Americans.
 
D

DervMan

Jan 1, 1970
0
Adrian said:
DervMan ([email protected]) gurgled happily, sounding much like they
were saying :


As you so ably demonstrate.

Yup. I don't have a problem with my inability since British or English is
not my first language, fortunately I have a spellchecker that can help me
out with most things...
 
D

daestrom

Jan 1, 1970
0
SteveH said:
*sigh*

It's a perfectly correct sentence. In terms of ancient grammar it may be
technically wrong, but it's a perfectly acceptable phrase to use.

Not quite. Since 'bastardised forms' is a plural none, the correct
reference would be "There are" or "There're". You used "There's" which is a
contraction of "There is", which is meant for use with singular objects, not
plural ones.

Even 'American's can spot that error in your English.

daestrom
 
I

Ian Dalziel

Jan 1, 1970
0
Do you even comprehend the irony of your words? If you're going to claim to
own it, please do at least learn how to write it correctly.

That'd be [sic], then.
 
J

John Henderson

Jan 1, 1970
0
DervMan said:
Talk to most Americans and they'll say they speak American
English.

Talk to most Americans and they won't hear you. After September
11 2001, they didn't hear a word of the responses to the query
"Why do they hate us so?"

John
 
D

DervMan

Jan 1, 1970
0
John Henderson said:
Talk to most Americans and they won't hear you. After September
11 2001, they didn't hear a word of the responses to the query
"Why do they hate us so?"


Is this from a limey newspaper?
 
D

Don Kelly

Jan 1, 1970
0
----------------------------
daestrom said:
Not quite. Since 'bastardised forms' is a plural none, the correct
reference would be "There are" or "There're". You used "There's" which is
a contraction of "There is", which is meant for use with singular objects,
not plural ones.

Even 'American's can spot that error in your English.

daestrom
-----------------------
I am curious about two things.
a) Yorkshire is part of England- what language is spoken there?
b)What has all this to do with electrical engineering?

As a Canadian, eh, I can cope with both US and British English. I don't
pretend to understand Yorkshire, Newfoundland, or Ozark dialects.
 
D

DervMan

Jan 1, 1970
0

I've no idea, it's a curious blend of languages...
 
S

Skenny

Jan 1, 1970
0
You know what I hated about the movie "An American Werewolf in London"?
Trying to understand the bloody accents of the chaps in the little bar room.
I suppose that was english, I mean it WAS in England and all, so what else
could it had been?
 
R

Ross

Jan 1, 1970
0
Roy Lewallen said:
No, reverse bias is the normal mode of operation for many semiconductors,
including the transistor collector-base junction, and rectifier diodes
which are reverse biased for most of the AC cycle. What's potentially
damaging to some semiconductors is reverse biasing at a voltage high
enough to cause breakdown. If done repeatedly to the emitter-base junction
(which is normally forward biased), it can result in reduced transistor
hfe. Of course, since substantial current flows when breakdown occurs,
there's also the possibility of complete destruction, e.g., melting of the
silicon, due to heating. Zener diodes are intentionally operated in this
mode, and the designer has to make sure they don't get sufficient current
to be damaged.

In contrast, forward overvoltage is difficult to achieve. Because of the
exponential I-V relationship of a forward biased diode junction, it takes
a great deal of current to raise the forward voltage much. That's why a
reverse connected shunt diode makes an effective limiter for negative
transients. (Negative transients forward bias it.) There is the
possibility that some junctions in the device to be protected will turn on
at or near the same voltage as the snubber diode, but they're likely to be
current limited in some way. If not, a hot carrier diode, with its lower
forward voltage, might be used.

The best approach is to use devices like ICs which are specifically
designed to survive in the automotive environment -- where another very
significant hazard to electronic components is potentially extreme
temperatures.

Look, does it make a bang and smoke and sparks or not???

;-)

Ross
 
|
| snip
|> |> > I sometimes have to jump start my old car when its battery is too weak
|> > to start it.
|> >
| snip
|
| Let me expand this discussion slightly. If the "fresh" battery is
| connected to a charger
| such as a car alternator, then leaving it for a few minutes to get some
| charge into it
| is a great idea.
|
| However, if it is just a fully charged battery it cannot under any
| circumstances charge
| the dead battery. You need at least 12.9 volts to get the battery
| chemistry flowing in
| the right direction, but the voltage of even a fully charged battery
| will not be this high.

I disagree. I have accompished charging one battery that was drained
by paralleling it with another battery of like construction. But for
the most part, what you say is valid. The drained battery was not
overdrained to where it might be damaged, and it didn't get anywhere
near a half charge from the connection. But it did charge enough to
see some voltage from it again. Of course, the ideal is to have enough
voltage to keep charging current flowing up to full charge. But to say
such charging simply cannot even get started from battery to battery is
just not consistent with my experience.
 
A

Adrian

Jan 1, 1970
0
computar2006 ([email protected]) gurgled happily, sounding much like
they were saying :
If you want to help jump start someone else's car, then be prepared to
fork out for a new battery. I jumped started my friend's shogun with
my nissan micra and my battery stopped charging shortly afterwards.

Complete crap.
 
G

Grimly Curmudgeon

Jan 1, 1970
0
We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember "computar2006"
If you want to help jump start someone else's car, then be prepared to
fork out for a new battery. I jumped started my friend's shogun with
my nissan micra and my battery stopped charging shortly afterwards.

Your battery was on its last legs anyway. No way could jumpstarting
knacker your battery.
 
A

Adrian

Jan 1, 1970
0
([email protected]) gurgled happily, sounding much like they were
saying :
As far as I know, all modern cars have 12V, negative ground systems

Some use 42v now, notably 7-series BMWs, and - of course - most trucks are
24v
 
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