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Purpose of 3rd band in resistor being black.

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notsob:
you can also load electrodroid app to you android phone which has lot of basic electronic help

Siwastaja:
You know, the someone who came up with the colors was a genius. They follow the spectrum of the visible light. If you take it further, even black and brown fit there in a intuitive manner; that's how black bodies look like when you lower the temperature further from the red-glowing.

The only thing left to remember is the order of grey and white appended at the end of the rainbow, they are kinda extras.

I find this much easier and more intuitive than any word play, but YMMV. Maybe it's because I'm messing up with light-related things so the spectrum is very deep in my mind.

MarkF:

--- 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 ---

Here are a few others from Wikipedia:

* Big Boys Race Our Young Girls But Violet Grey Wins
* Big Boys Race Our Young Girls But Violet Generally Wins
* Better Be Right Or Your Great Big Venture Goes West
* Beetle Bailey Runs Over Your General Before Very Good Witnesses
* Beach Bums Rarely Offer You Gatorade But Very Good Water
* Buster Brown Races Our Young Girls But Violet Generally Wins
* Better Be Right Or Your Great Big Vacation goes Wrong
* Better Be Right Or Your Great Big Plan Goes Wrong (p=purple for violet)
* Better Be Right Or Your Great Big Values Go Wrong
* Back-Breaking Rascals Often Yield Grudgingly But Virtuous Gentlemen Will Give Shelter Nobly (with tolerance bands Gold, Silver or None)
* Black Beetles Running Over Your Garden Bring Very Grey Weather
* Bad Booze Rots Our Young Guts But Vodka Goes Well – get some now
* Bat Brained Resistor Order You Gotta Be Very Good With
* Big Beautiful Roses Occupy Your Garden But Violets Grow Wild
* Black Bananas Really Offend Your Girlfriend But Violets Get Welcomed
* Black Birds Run Over Your Biting Visible Grey Worms
* Badly Burnt Resistors On Your Ground Bus Void General Warranty
* Billy Brown Ran Out Yelling Get Back Violet's Getting Wet
* Better Be Right Or You're Gonna Be Violently Gouged With Golden Spaghetti
* Bright Boys Rave Over Young Girls But Veto Getting Wed
* Black Bears Raid Our Yellow Green Bins Violently Grabbing Whatever Goodies Smell Nice
* Big Brown Rabbits Often Yield Great Big Vocal Groans When Gingerly Slapped Needlessly
* Betty Brown Runs Over Your Garden But Violet Grey Walks

Brumby:
I just remembered: Black - Brown - rainbow - Grey - White.  Starting at Black, ending with White, the Brown and Grey just naturally fit in.

Zero999:

--- Quote from: Brumby on July 26, 2019, 02:25:15 pm ---I just remembered: Black - Brown - rainbow - Grey - White.  Starting at Black, ending with White, the Brown and Grey just naturally fit in.

--- End quote ---
Yes, that's how I remember it.

The one our electronics teacher used to teach us way Bye by Rosie, off you go, but via Great Western.

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