In a message dated 15-Jul-99 00:00:54 Eastern Daylight Time,
tjordan@vic.bigpond.net.au writes:
> But if it were simply an arbitrary choice of positive earth, and there are
> no particular advantages in either arrangement, then why did we
> subsequently go to the trouble of changing to negative earth?
>
The standard is now negative earth because electrons flow from negative to
positive and it is easier to visualize that when examining modern electrical
circuits. The old "Current flow" theory doesn't work when explaining vacuum
tube and modern electronic circuits. Cheers.
Art Kelly
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