| 4 - Band Resistor Code | |||||
| 4-band resistor colour code | Band 1 | Band 2 | Band 3 | Band 4 | |
| (multiplier) | (tolerance) | ||||
| Black | 0 | 0 | X 1 | - | |
| Brown | 1 | 1 | X 10 | +/- 1 % | |
| Red | 2 | 2 | X 100 | +/- 2 % | |
| Orange | 3 | 3 | X 1000 | - | |
| Yellow | 4 | 4 | X 10000 | - | |
| Green | 5 | 5 | X 100000 | +/- 0.5 % | |
| Blue | 6 | 6 | X 1000000 | +/- 0.25 % | |
| Violet | 7 | 7 | X 10000000 | +/- 0.1 % | |
| Grey | 8 | 8 | - | - | |
| White | 9 | 9 | - | - | |
| Gold | - | - | X 0.1 | +/- 5 % | |
| Silver | - | - | X 0.01 | +/- 10 % | |
| Value is | |||||
| 27K+/-10% | 2 | 7 | X 1000 | +/- 10 % | |
