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The color
bands on a resistor indicate the resistance value of a resistor.
As shown
in Figure 1, a common resistor usually has 4 color bands, the first
two of which indicates the first and second digit of its resistance
value while the third band indicates the number of zeros that
follows the first two digits. The fourth band indicates the
error or tolerance of the resistor. For example, the top
resistor in Figure 1 has a resistance value of 1 kilo-ohm (10 ohms x
100) +/- 5%. Some resistors have 5 color bands to indicate their
resistance values more precisely, an example of which is the bottom
resistor of Figure 1.
Figure
1. The color bands of a resistor indicate its
resistance value
(see Table 1)
Table
1. Resistor Color Codes (Refer to Figure 1)
|
Color |
1st
Digit |
2nd
Digit |
3rd
Digit |
Multiplier |
Tolerance |
|
Black |
0 |
0 |
0 |
1 |
- |
|
Brown |
1 |
1 |
1 |
10 |
- |
|
Red |
2 |
2 |
2 |
100 |
- |
|
Orange |
3 |
3 |
3 |
1K |
- |
|
Yellow |
4 |
4 |
4 |
10K |
- |
|
Green |
5 |
5 |
5 |
100K |
- |
|
Blue |
6 |
6 |
6 |
1M |
- |
|
Violet |
7 |
7 |
7 |
10M |
- |
|
Gray |
8 |
8 |
8 |
100M |
- |
|
White |
9 |
9 |
9 |
1G |
- |
|
Gold |
- |
- |
- |
0.1 |
5% |
|
Silver |
- |
- |
- |
0.01 |
10% |
|
No Color |
- |
- |
- |
- |
20% |
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