Re: About plugging things.

[David Bowman <David_Bowman@GEORGETOWNCOLLEGE.EDU>]

Regarding Nexus Replicant's questions:

> Why is there a ground in electric appliances.

To make sure the metallic case of the appliance is always at ground
potential.  This would tend to insure one's safety when touching it.

>                                               Why not just having a
> positive and a negative wire.  I would also like to know if both the black
> and red wire are above ground or if one or both are below.  Thanks in
> advance to anyone who will answer.

Commercial power lines have supplied AC power to the public since
Westinghouse (using Tesla's superior AC system), understandably, beat out
his competitor Edison (who pushed DC power) in the marketplace around a
century ago.

Think about the meaning of AC.

David Bowman
David_Bowman@georgetowncollege.edu