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Re: Why positive ground?
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Posted by T_Bone on November 03, 2004 at 11:17:57 from (4.240.132.61):
In Reply to: Why positive ground? posted by Rosy on November 02, 2004 at 17:36:25:
Well I think if you look at how the welding process works would explain the disavantages of a negitive ground DC current system. Electron flow is from negitive to postive when dealing with DC current in welding resistance applications. In welding terms this is called straight polarity. Reverse polarity is when the electrode is positive and the work piece is negitive. With using straight polarity while welding, metal is transfered from the electrode (negitive) to the work piece (positive) (also called base metal) where alot of heat is generated on the work piece. This lets us use a cooler electrode and transfers alot of metal very fast to the work piece. Using straight polarity works well as the work piece in this case absorbs more heat than the electrode and can handle more heat input than the electrode as the work piece has more mass than an electrode. The same can be said of positive ground battery systems. Most of the heat will be generated in the tractor frame and not in the electrical componet. Since heat is a killer to componets of most electrical devices then a positive ground systems should last longer. I think if you did a side by side comparrision, positive ground compnets will by far out last negitive ground componets. Like Mark (txblu) pointed out, until the inventors of transistors changed there thinking of electron flow, the transistor could not work. In electronic semi-conductor circuits electron flow is always positive to negitive. T_Bone
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