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Resistor color codes are something that every electronics hobbyist should remember. You'll have it committed to permanent memory in no time!
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Here's one mnemonic "Bright Boys Rave Over Young Girls But Veto Getting Wed. Black, Brown, Red, Orange, Yellow, Green, Blue, Violet, Grey, White <=> 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.
Best method to memorize is - B.B. Roy of Great Britain Veto getting wed.- Alternatively, most of the colors are those from the traditional rainbow. Black is 0 (as in 'nothing'), Brown is 1, then Red through Violet, and finally Gray and White are 8 and 9.
- In Russian language, you can use the following phrase: "Четыре коровы красят ржавый железный забор синтетической формулой, содержащей белок" - чёрный, коричневый, красный, рыжий, жёлтый, зелёный, синий, фиолетовый, серый, белый. By the way, the phrase is translated as "Four cows paint a rusty iron fence with a synthetic formula containing protein".
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The multiplier band goes by the same code and can be read as "followed by N zeros", plus Gold for "divide by 10" and Silver for "divide by 100".
Tolerances are something of a mess: Brown and Red are 1% and 2% (you usually spot them because they have an extra significant digit), Gold and Silver are 5% and 10%, and 20% doesn't even get a tolerance band (you will rarely, if ever, come across one of these).
To read the whole thing, put the tolerance band at your right, and go like this: "green-brown-red-gold = 5-1-00-5% = 5.1K 5%". You'll get used soon enough, and a bit later you'll be spotting what you want at once. It's also easy to classify them by decade: red is Ks, orange is 10Ks ...
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- QuestionIf I suffer from color blindness, how can I read the resistance code?
DenneiskTop AnswererSimply remember the colors for the bands as you see them. If they're too similar, you may have to try something else. If you have monochrome colorblindness, then you could try to remember the shade of the bands. - QuestionIf the bands on a resistor are brown, green, and silver, what is the value of the resistor?
Community AnswerBrown Green Silver would be a 15 Giga Ohm resistor. It is assumed that you did not read the bands from outside to inside, which means Silver Green Brown. That would be 950 Ohms. Also the tolerance is a +/- value, which means the real value of the resistor is something between +/- 20% of the nominal value of 950 Ohms in this case.
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Tips
- The same code is used for inductors and capacitors, only that the "units" are uH and pF. That is, orange-white-red-gold is 3.9 mH or 3.9 nF, 5%.Thanks
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References
- https://www.swtc.edu/Ag_Power/electrical/lecture/resistors.htm
- http://www.weerstandcalculator.nl/resistor.php. An excellent calculator. It also finds the closest standard value from different series.
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