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Old 02-12-2012, 11:40 PM
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PCH (Paul)
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Join Date: Feb 2007
Location: Perth WA
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Hi Baz,

that resistor is 20 ohms ...

see here http://www.csgnetwork.com/resistcolcalc.html for the colour coding.

So you need brown black red for a resistance of 1k.

Just to point out how it works. In your pic, you start at the red end, or actually the end away from the gold band in this case, and you'll see three colours, then gold or silver, then the last colour means something else but you don't need to worry about that.

So you have Red, Black, Black.

Just write down the digits, instead of the colours, from the chart in the link I supplied. So counting down, red = 2, black = 0, next black also = 0.

You write the number (resistance value) down left to right as follows. The first two bands represent a part of the numberical value of the resistor, then the third band is the number of '0's to add to the first two numbers you just wrote down.

Therefore, in this case, write down a '2' and a '0', and the third band which is also black (number zero) means add zero '0's to the 20. So the value is just 20 ohms. If the third band were a red, it would mean add two zeros to the 20, - therefore 20+00 = 2000, or 2k ohms.

Hope that helps

Paul
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