The 4-band resistor color code is a widely used system for identifying the resistance value of resistors in electronic circuits. This coding method employs a combination of colored bands, each representing a specific numerical value, tolerance, and multiplier. The first two bands indicate the significant digits of the resistor’s resistance, while the third band represents the multiplier to scale the value. The final band denotes the tolerance level, which is crucial for determining the allowable deviation from the stated resistance. By decoding the colors, engineers, and technicians can quickly and accurately identify the resistance value of a four-band resistor, facilitating seamless circuit design and troubleshooting.
| Color | 1st Band | 2nd Band | 3rd Band (Multiplier) | Tolerance |
|---|---|---|---|---|
| Black | 0 | 0 | 1 Ω | |
| Brown | 1 | 1 | 10 Ω | ±1% |
| Red | 2 | 2 | 100 Ω | ±2% |
| Orange | 3 | 3 | 1 kΩ | |
| Yellow | 4 | 4 | 10 kΩ | |
| Green | 5 | 5 | 100 kΩ | ±0.5% |
| Blue | 6 | 6 | 1 MΩ | ±0.25% |
| Violet | 7 | 7 | 10 MΩ | ±0.10% |
| Grey | 8 | 8 | ±0.05% | |
| White | 9 | 9 | ||
| Gold | 0.1 Ω | ±5% | ||
| Silver | 0.01Ω | ±10% |