Decoding Resistor Values
This quick guide shows you how to identify different resistors. A resistor is a passive electrical component that creates resistance to the electrical flow, limiting the amount of current reaching a certain part of the circuit. In this book, you use resistors mainly to limit the amount of current reaching LEDs.
Use this resistor color chart to help you calculate a resistor’s resistance value from the bands on its body.
COLOR |
FIRST BAND |
SECOND BAND |
THIRD BAND |
MULTIPLIER |
TOLERANCE |
Black |
0 |
0 |
0 |
1 Ω |
|
Brown |
1 |
1 |
1 |
10 Ω |
+/–1% |
Red |
2 |
2 |
2 |
100 Ω |
+/–2% |
Orange |
3 |
3 |
3 |
1 KΩ |
|
Yellow |
4 |
4 |
4 |
10 KΩ |
|
Green |
5 |
5 |
5 |
100 KΩ |
+/–0.5% |
Blue |
6 |
6 |
6 |
1 MΩ |
+/–0.25% |
Violet |
7 |
7 |
7 |
10 MΩ |
+/–0.10% |
Gray |
8 |
8 |
8 |
|
+/–0.05% |
White |
9 |
9 |
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