Resistors
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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%

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.
abcd
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