posted
As far as positive ground being dangerous,it was a common practice in tractors for decades. A friend of mine has a positive ground tractor, and it responds to jacks and metal poles just like a normal car would...
sayin the battery would short to a pole is saying that if you took a "AA" battery and stuck it "+" down into the ground, that it would discharge. Or that you could hook a lightbulb to the "+" of one battery, and the "-" to another battery and have it turn on without any other connection between the batteries... (neither of those things will happen BTW)
The reason it all works, is because of the nature of the chemical battery. A battery will only make a charge across it's terminals. I cant really explain it, but something with the way the electrolyte and metals work only makes electricity when power flows through the battery, not to or from. You can put anything in the world on one terminal (either one) and nothing will happen. You need to have a complete circuit from one terminal to the other.
Posts: 45 | From: Richmond, VA | Registered: Apr 2004
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quote:Originally posted by Bumpin' Yota: a positive ground on a car theoretically could work, however there are a few problems to say the least as shadow star was giving clues to...
I just wanna see what happens if someone were to have a positive ground to the chassis/frame/engine block crash into a metal light pole! Or even better try to jack up the axle to change a tire....lol
Has no one here ever worked on an older british car, such as an MGB or any of the Triumph's? They were all "positive earth" as they say.
Posts: 2 | From: Washington | Registered: Aug 2003
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posted
Arn't Single Post Alternator's Positivly Grounded? And you don't want to mix Positivly Grounded systems with negitivly grounded systems. It causes a big problem!!
-------------------- New Toy YFZ450 04' White / Red Lots of Mods and very fast. --------------------------- Next Project is Finish up 91' S-10. Some Day!! Posts: 86 | From: Olympia | Registered: Oct 2003
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quote:Originally posted by TeK 23: Arn't Single Post Alternator's Positivly Grounded?
No.
Positive ground is not very common at all, it is virtually non-existant nowadays. The only cars that I have heard of using it were some old British cars. I don't know when they changed over to negative ground but it was a while ago, maybe the 1960's or early 70's. Unless you are working on an old British car you will most likely not have a positive ground.
Posts: 327 | From: Pleasanton & Sacramento Ca | Registered: Dec 2001
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posted
Positive ground will work. In many cases it is better.Theory would make you think it would not matter,but in the real world it does. The mixed mode systems (AC & DC both used) i've seen work better and have less noise problems when the positive terminal of the DC voltage is "common" to the neutral of the AC supply. Also all the signal switching should be on the negative side.
This is from everyday repair,maintence and design of electronic systems using three phase power and low and high voltage dc power in real world applications.
-------------------- My 45's want fit in that slot! Posts: 1169 | From: Rowlett, TX, USA | Registered: Jun 2000
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posted
a positive ground? what do you think it means? instead of negative flowing through chassis, positive does. it's weird when you think about it.. lol
-------------------- http://www.sounddomain.com/id/xe0us RE SX 15(THE XXX OWNED MY ELECTIRCAL SYSTEM, WOW) Pioneer DEH-P860MP Earthquake PH-D2 KnuKonceptz/Stinger Wiring Infinity Reference 6002si Speakers ExcessiveAmperage 200A Alt.(Screwed up now, Using stock Alt with SX) Ipod for mp3's
Real soon "to get"'s: Infinity Kappa Perfect 6.1 (bought) Optima Yellow Top Rockford Fosgate 400s Posts: 384 | From: Connecticut | Registered: Jun 2004
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posted
"What's the arguement? If you look at what I previously posted, that is exactly like all texts on the subject would describe it. Back in the 1800's and early 1900's there was arguement, but there hasn't been any for a long time. "
Think what you want, last EE class I took allbeit that was 15 years ago, no one could confirm hole flow vs electron flow. It's theory anyway doesnt make a hill of beans diff.
"DDSTANG hit it right on the head...electrons, which represent a NEGATIVE charge, flow from - to +. "Current," usually meant as the flow of POSITIVE charge, is therefore in the opposite direction of electron flow. Kid of confusing, but thats the way it is.
In electrical engineering, there's a charge carrier called the "hole" thats often used to represent a positive charge. Physically, a "hole" is simply the absence of an electron, much in the way that "dark" is really the absence of light."
Very true, that is the accepted theory. It's all based on a point of reference. Thats all you need.
Posts: 8 | From: Atlanta | Registered: Aug 2004
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quote:Originally posted by ddstang: As was stated before electrons do flow from negative to positive. But what gets people confused is that current flows from positive to negative, or by its definition it is the direction in which positive charge carriers flow. A long time ago they thought that electricity was the flow of positive charge carriers but they turned out to be wrong and thus today the definition of current flow seems to be backwards from what would be logical.
We can thank good old Ben Franklin for that one. He messed up current flow for all of us. In most of my classes we just refer to conventional current flow and electron current flow.
Posts: 121 | From: Streator, IL | Registered: Jun 2000
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posted
deep thoughts . . . anyone feel as if this exchange of information was beneficial?
Posts: 144 | From: Phoenix, AZ | Registered: Oct 1999
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