How can one see what value a resistor is given the colors? For example, what's the value of Red - Orange - Green - Gold?
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1This is easily googlabe. – MDMoore313 Mar 14 '13 at 17:42
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1Lots of reference on the internet. There is even an [xkcd](http://xkcd.com/992/) about it – angelatlarge Mar 14 '13 at 17:49
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1The question has been changed to make this question more broad. Please reconsider your downvotes. – Mar 14 '13 at 18:12
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@LeonHeller that's about the 'background colour'. This is about the colour codes. – Mar 14 '13 at 18:28
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3This one, then: http://electronics.stackexchange.com/questions/6173/how-to-find-the-resistor-value-using-the-color-codes?rq=1 – Leon Heller Mar 14 '13 at 18:31
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Voting to close as duplicate. – The Photon Mar 14 '13 at 18:47
1 Answers
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There are many resistor calculators on the 'net (e.g this one):
Normally the first two bands are the significant digits and the third is the multiplier, so for example, red/orange/green would indicate 23 * 10^5 = 2.3MΩ
The fourth band indicates tolerance, gold is +- 5%.
There are odd standards out there, including 5 (see asterisk in table above) and 6 band resistors and resistors with the values printed on them. For SMT resistors there are various systems also.
Further reading:
Electronic color code
Oli Glaser
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