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Resistor Codes
 Resistor Colour Codes Note If there is only 3 colour bands, the missing one will be band d.The absence of band d implies the resistor accuracy is ±20%  To read the code, 1. Write down the digit provided by the colour of band a 2. Write down the digit provided by the colour of band b 3. Write down the multiplier provided by the colour of band c 4. You have found the resistance in Ohms 5. If band d is present, this indicates the accuracy of the component. a b c d 0 0 x100Ω 1 1 x101Ω ±1% 2 2 x102Ω ±2% 3 3 x103Ω 4 4 x104Ω ±5% 5 5 x105Ω 6 6 x106Ω 7 7 x107Ω 8 8 x108Ω ±10% 9 9 x109Ω
 Three Digit Resistor Number Codes 1. Write down the first 2 digits (shown as a on the diagram) 2. Write down "x10" 3. Write down the x10 multiplier given by the third digit 4. This is the resistance in Ohms  Here are some examples 234 = 23 x104Ω = 230kΩ 170 = 17 x100Ω = 17Ω 135 = 13 x105Ω = 1.3MΩ
Number and One Letter Resistor Codes

1. Write down all digits before the letter. (If there are no digits before the letter then write "0")
2. Write down a decimal point "."
3. Write down all the digits after the letter
4. Look the letter up in this table and write down the answer
 Letter Answer R Ω k kΩ M MΩ G GΩ

Here are some examples
23M45 = 23 . 45 M Ω = 23.45MΩ
470k = 470 . 0 k Ω = 470kΩ
1R2 = 1Ω2 = 1.2Ω
1k = 1kΩ
12G0 = 12.0GΩ
G47 = 0.47GΩ = 470MΩ
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