Newbie that don't understand

[Peter Hansen]

Jim wrote:
> 
> Peter Hansen wrote:
> > Just a dude wrote:
> 
> >>My son is an electronics
> >>design engineer, and I still can't get my head around negative
> >>voltages, how the hell do you get a -12 V supply... to him it's basic
> >>but to me..............
> 
[snip my own reply which rather missed the mark this time,
because it's too embarrassing to leave in :-)]

> While this is way off topic and way pedantic, electrons
> always leave and enter the same terminals (think electro-
> chemistry, like a battery). 

D'oh!  What was I thinking?  And they call me an engineer. :(

Jim is quite right of course.  Grumble grumble.

-Peter