Posted by MarkB_MI on December 22, 2008 at 15:06:46 from (216.234.98.47):
In Reply to: positive ground posted by larry cook on December 22, 2008 at 10:54:20:
Like Gerald said, it doesn't really matter. It used to be taught that electricity flows from positive to negative, and as far as I know it's still taught that way in the military schools. But for a long time engineering schools have taught negative to positive because negative polarity fouls up the math. So pretty much any system designed in the last fifty years is going to use negative ground for the simple reason that electrical engineers think that way.
I used to train military technicians on maintenance and repair of weapons systems. The particular system was a mixture of analog and discrete logic components, and of course they were designed by engineers who thought "positive to negative". I found it impossible to communicate to the technicians how to follow the logic of the circuit using the "negative to positive" convention they were familiar with. But then I told them. "OK, forget everything you learned in school: For now, current flows positive to negative." I was then able to explain the logic and they immediately grasped it. Now that may be a reflection on how bad of an instructor I was, but I know that I permanently corrupted several techs who never thought "negative to positive" again.
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