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Old 01-12-2011, 11:57 PM #17
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Default Re: what component is this?

The multiplier bit is easy to remember if you think of it as being 10^x, x being the digit the color represents.
So 10^black = 1, 10^brown=10,etc....

So gold would be -1 and silver -2.


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Old 01-13-2011, 01:00 AM #18
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Default Re: what component is this?

Quote:
Originally Posted by Eudaimonium View Post
Color black can never be in first place.
One exception to that

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Old 01-13-2011, 03:06 AM #19
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Default Re: what component is this?

0 ohm resistors have to be one of the funniest components created
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Old 01-13-2011, 01:14 PM #20
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Default Re: what component is this?

LOL, yes, and that was done just for the comodity of the automated positioning machines (cause it's much more easy, for a positioniong machine, to manage "standard size" components, than just wire pieces).

(ofcourse, this is an advantage only til someone exchange them with the 100K resistors wheel in the machine for joke )
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Old 01-13-2011, 01:46 PM #21
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Default Re: what component is this?

Yeah I have a lot of these SMD 0 ohm ... well, can't call them resistors now, can we?
Jumpers?

They always have traces running under them, so I believe they were added for ease of designing the PCB and all. Without them, perhaps you'd have to move a lot of components around and use a lot more vias to get the connections right (if you even get them).

So I'd disagree about them being funniest components.
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Old 01-13-2011, 03:26 PM #22
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Default Re: what component is this?

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Originally Posted by Things View Post
0 ohm resistors have to be one of the funniest components created
Yeah, take the inverse of 0 ohms and you get 1/0 siemens of conductance.

That's either a superconductor, or a confused calculator with "syntax error" on your hands!
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Old 01-13-2011, 07:53 PM #23
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Default Re: what component is this?

Quote:
Originally Posted by Meatball View Post
Yeah, take the inverse of 0 ohms and you get 1/0 siemens of conductance.

That's either a superconductor, or a confused calculator with "syntax error" on your hands!
Well if we were to simplify stuff now, a number divided by zero would be infinite. So, conductance is infinite, current flows without any possible losses.

However that's ideal, we all know there's always some resistance.
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Old 01-13-2011, 08:29 PM #24
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Default Re: what component is this?

I wonder, how long until we get room-temperature superconductors?
Now THAT would be a proper and useful 0 Ohm resistor.
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Old 01-13-2011, 08:31 PM #25
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Default Re: what component is this?

Quote:
Originally Posted by anselm View Post
I wonder, how long until we get room-temperature superconductors?
Now THAT would be a proper and useful 0 Ohm resistor.
Not long I'd guess, they have been sucessful in making one at only -80°C, instead of temps close to apsolute zero.

At least, so I've heard.
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Old 01-14-2011, 05:28 AM #26
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Default Re: what component is this?

Quote:
Originally Posted by anselm View Post
I wonder, how long until we get room-temperature superconductors?
How about an ionized HeNe tube? Those have negative resistance I hear, so a pot in series should allow adjustment to precisely 0 ohms

Screw liquid helium, MRIs should use HeNe lasers!
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Old 01-14-2011, 09:07 AM #27
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Default Re: what component is this?

Quote:
Originally Posted by Cyparagon View Post
How about an ionized HeNe tube? Those have negative resistance I hear, so a pot in series should allow adjustment to precisely 0 ohms

Screw liquid helium, MRIs should use HeNe lasers!
Isn't negative resistance impossible to make?

I mean, you'd actually get more energy on output than input of such system. Unless you take some other energy and input that into existing system, but that's negative resistance, that's just added energy from another source.

And since Gas Lasers release a lot of light and terribly more heat, how can one assume it's negative resistance?
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Old 01-14-2011, 09:18 AM #28
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Default Re: what component is this?

I think the actual record for superconductive material is still 254K (19C) ..... don't know if the element have a name, the chemical formula is "(Tl4Ba)Ba2Ca2Cu7O13+" (try to pronounce it all in a row ) ..... not 100% sure, anyway, i've seen that in a page from jan 2010, maybe in the meantime someone discovered something better .....



EDIT:

Quote:
Originally Posted by Eudaimonium View Post
Isn't negative resistance impossible to make?
Negative resistance already exist in nature ..... it's called "woman" (poke them with some energy, and you will receive much more energy in reply ..... j/k )
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Old 01-14-2011, 09:34 AM #29
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Default Re: what component is this?

Quote:
Originally Posted by HIMNL9 View Post
I think the actual record for superconductive material is still 254K (19C) ..... don't know if the element have a name, the chemical formula is "(Tl4Ba)Ba2Ca2Cu7O13+" (try to pronounce it all in a row ) ..... not 100% sure, anyway, i've seen that in a page from jan 2010, maybe in the meantime someone discovered something better .....



EDIT:



Negative resistance already exist in nature ..... it's called "woman" (poke them with some energy, and you will receive much more energy in reply ..... j/k )
Formula was like, from top of your head right this moment? If no, could you provide link to page you've read it?

Oh and about women, it's no wonder, they are known to openly oppose all laws of physics, this one is no exeption.

EDIT:
From wiki:
Quote:
From about 1993, the highest temperature superconductor was a ceramic material consisting of thallium, mercury, copper, barium, calcium and oxygen (HgBa2Ca2Cu3O8+δ) with Tc = 138 K.[26]
http://en.wikipedia.org/wiki/Superconductivity
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Old 01-14-2011, 10:02 AM #30
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Default Re: what component is this?

Quote:
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Formula was like, from top of your head right this moment? .....
LOL, not for sure ..... i had to search in my bookmarks (and luckily that page was one of the few that i've not lost in the last crash )

Superconductor World Record Surpasses 250K
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Old 01-19-2011, 03:35 AM #31
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Default Re: what component is this?

Theres another program with electronic formula's and codes, for the iphone called "electronic toolbox" I use it all the time
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Old 01-19-2011, 04:36 AM #32
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Default Re: what component is this?

Looks to me like a diode and a resistor had a child
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