Here are some online resources for you to check 

http://www.lightingfacts.com/Lamp%20Wiring.html

http://www.hometips.com/content/lamps_intro.html

http://www.ehow.com/how_117605_fix-lamp.html

I've not had trouble wiring lamps.  The third connection might be for
three wire cords tying the lamp to earth ground to (maybe) prevent
shocks.



> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of Bill Kuncicky
> Sent: Wednesday, February 15, 2006 1:43 PM
> To: Microcontroller discussion list - Public.
> Subject: [EE] Socket for AC light bulb
> 
> This may be the dumbest question ever asked on here, but I haven't had
> any experience with AC stuff and am stumped.
> 
> My wife has an old lamp that belonged to her grandmother, and is
> probably more than 70 years old.  She cherishes it.  Yesterday, the
> on-off switch in the socket broke, so I stopped by Home Depot and
picked
> up a new socket.  This morning I took the lamp apart and replaced the
> socket.  The electric cord has two wires, as do most lamps.  The
socket
> has three terminals at the bottom.  Two of them are connected through
> the switch.  Turn the switch on and these two are connected.  Turn the
> switch off and these two are not connected.  The third terminal goes
to
> the side of the socket -- the part that has the threads on it for the
> light bulb to screw into.  The third terminal doesn't look like it is
> meant to have a wire connected to it, although there is a screw there.
> 
> It seems to me that the two wires of the electrical cord should go to
> the two terminals that are connected through the switch.  But when I
> wire it this way, the bulb does not come on.
> 
> I don't really like fooling around with 110 volts AC stuff.  I like 5
> volts DC stuff a lot better.  So figured that maybe I had better ask
> someone, even if it is considered a stupid question.  I may get an
> answer out of pity.  :-)
> 
> Bill
> --
> 
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist


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