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Richard9999 09-28-2008 12:33 AM

Positive/negative?
 
It's been almost 50 years since I was in jr. high electrical class... I'm repairing a lamp. I've got a brass colored terminal and a silver color terminal. I assume the brass colored one is positive and the silver is negative. But I don't want to burn the house down. Can anyone confirm this or set me straight?

Thanks!

rgsgww 09-28-2008 12:50 AM

Quote:

Originally Posted by Richard9999 (Post 161801)
It's been almost 50 years since I was in jr. high electrical class... I'm repairing a lamp. I've got a brass colored terminal and a silver color terminal. I assume the brass colored one is positive and the silver is negative. But I don't want to burn the house down. Can anyone confirm this or set me straight?

Thanks!


Yes, you are correct. In a lamp cord the wire that is rigid is the "negative" (actually is known as the neutral) and the smooth wire is the "positive" (also, is referred to as the "hot")

Billy_Bob 09-28-2008 01:05 AM

The neutral wire should be wired to the light socket "ring", the hot wire should be wired to the light socket base as shown in the following diagram. And if it is a lamp with a cord and plug, the large prong on the cord should be connected to neutral which then connects to the light fixture socket "ring". This type of plug is called a "polarized" plug.

http://www.rd.com/images/tfhimport/2...g001_size2.jpg

Billy_Bob 09-28-2008 01:13 AM

P.S. House wiring uses "Alternating Current" (the + and - switches back and forth).

Batteries like in a car or for your flashlight use "Direct Current".

More on this...
Alternating Current...
http://en.wikipedia.org/wiki/Alternating_current

Direct Current...
http://en.wikipedia.org/wiki/Direct_current

SD515 09-28-2008 02:32 AM

The purpose of attaching the neutral to the screw shell is to prevent electrical shock if the shell is touched, as in when changing the bulb.

Richard9999 09-28-2008 02:53 AM

Thanks for the kind instruction, gentlemen!
 
The light is working. The house ain't on fire. The wife is happy.

SD515 09-28-2008 12:16 PM

...and Richard gains some brownie points...Good job :thumbsup:

HandyPete 09-28-2008 06:46 PM

RGSGWW.... you should NOT be posting your knowledge about electricity. Your post clearly indicates that you do not understand the basics of DC and AC circuits.
--pete

Pudge565 09-28-2008 09:13 PM

Funny I was going to tell him he was totaly wrong since home wiring is ac so has neutral and "hot" not positive and negative.:laughing:

SD515 09-28-2008 09:56 PM

Grounded and ungrounded if you want to get technical. Personally I don't see why you are jumping on rgsgww, the OP was the one that first mentioned positive and negative. Granted rgsgww maybe could have been a little more descriptive in showing that houses use AC, not DC, and the differences, but I don't see where he is wrong. Re-read his post and the OP's post.

Pudge565 09-29-2008 09:53 AM

Quote:

Originally Posted by SD515 (Post 162132)
Personally I don't see why you are jumping on rgsgww, the OP was the one that first mentioned positive and negative.

If you are directing this to me I wasn't directing it towards him I was directing it towards the OP. Sorry for any confusion should of put a quote in my post.

HandyPete 09-29-2008 06:08 PM

Quote:

Originally Posted by SD515 (Post 162132)
Grounded and ungrounded if you want to get technical.

almost as bad..lolol

In my book, anyone who mentions "positive" and "negative" deserves to be corrected immediately with a direct, simple and polite answer, not some kind of round-about explanation that doesn't set the record straight.

:)


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