Electronics > Beginners
Purpose of 3rd band in resistor being black.
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Berni:
Yeah i always used the reasoning from the rainbow with the black and brown sort of going into infrared as that's pretty much what it would look like it you swept the wavelength down so deep.The white and gray are so rare to see on resistors i never bothered.

Colorful ribbon cable also follows the same color sequence:
Stray Electron:

--- Quote from: R502 on July 26, 2019, 02:31:09 am ---Ok thank you guys for the replies. I understand it a little better now.

And that is not a very nice mnemonic.

--- End quote ---

  Then you would have HATED the original. Substitute the word "Black" for "Bad"
Brumby:
Having learned the colour code (so many years ago I dare not even think how many) I was intrigued when the company I worked for at one time did a re-vamp of their filing system.  All new fittings and folders - with a colour-coded labelling system.

The alphabetic colour assignments were curious, however I didn't have any previous scheme to compare against, so that was just a learning curve.  However, I was extremely annoyed to find the creators of this system did not use the numeric:colour coding system that had been in place for more than 50 years - but created their own.  It had no logical structure.

If they had used proper colour coding, I would have been able to pick out a file from the other side of the room on day 1.  I am thankful I only had to deal with it on an infrequent basis.
Brumby:
PS.  The choice of blue bodies for metal film resistors was, I think, the worst decision possible.  Makes picking the colours very difficult at times.

Whoever agreed to that needs to be shot.
T3sl4co1l:
Also, going the other direction: what if 5-band resistors dropped the black multiplier?  Then a 475 ohm resistor would look like 4.7 megs!

Likewise, dropping the multiplier on a 4-band marking would make e.g. 47 ohm 5% look like 4.7 ohm 20%.

Tim
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