Posted by jdemaris on December 22, 2008 at 15:34:59 from (67.142.130.19):
In Reply to: positive ground posted by larry cook on December 22, 2008 at 10:54:20:
There are two competing theories of electric flow - the Electron Theory and the Hole Theory. They have electricity flowing opposite directions and neither theory has ever been proven.
At one time, engineers that favored the Hole Theory favored postive ground, and engineers that favored the Electron Theory favored negative ground. Some engineers designed electrical systems on cars and trucks to have both grounds with an automatic "polarity changer."
When semiconductors came into common use - one standard had to be chosen for consumer good.
Postive ground is still used in many applications and, in some, prevents certain types of corrosion - especailly in some marine-military applications.
None is better overall, but each is slightly better for certain uses.
And, nobody knows which way electricy flows - that's why it's called "theory." Otherwise, it would be the Electron Hypothesis or Electron Rule.
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