Resistors are essential components in electronic circuits. They control current, divide voltage and help protect sensitive electronic components.
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| Resistor Colour Code. |
But how do you identify a resistor's value? Most traditional resistors use coloured bands to indicate their resistance and tolerance. This system is known as the resistor colour code.
1. Understanding Resistor Colour Codes
A standard 4-band resistor uses four coloured bands:
- Band 1: First significant digit
- Band 2: Second significant digit
- Band 3: Multiplier
- Band 4: Tolerance
2. Resistor Colour Code Chart
| Colour | Digit | Multiplier | Typical Tolerance |
|---|---|---|---|
| Black | 0 | ×1 | - |
| Brown | 1 | ×10 | ±1% |
| Red | 2 | ×100 | ±2% |
| Orange | 3 | ×1,000 | - |
| Yellow | 4 | ×10,000 | - |
| Green | 5 | ×100,000 | ±0.5% |
| Blue | 6 | ×1,000,000 | ±0.25% |
| Violet | 7 | ×10,000,000 | ±0.1% |
| Grey | 8 | ×100,000,000 | ±0.05% |
| White | 9 | ×1,000,000,000 | - |
| Gold | - | ×0.1 | ±5% |
| Silver | - | ×0.01 | ±10% |
3. How to Calculate a Resistor Value
Let's use a common example:
Brown – Black – Red – Gold
- Brown = 1
- Black = 0
- Red = ×100
- Gold = ±5%
Calculation:
10 × 100 = 1,000Ω = 1kΩ ±5%
4. How to Read the Bands Correctly
- Identify the tolerance band, often gold or silver.
- Position the resistor so the tolerance band is on the right.
- Read the remaining bands from left to right.
- Calculate the resistance using the digits and multiplier.
5. Why Is Resistor Tolerance Important?
Tolerance indicates how much the actual resistance can vary from its nominal value.
For example, a 1kΩ resistor with ±5% tolerance can have an actual resistance between 950Ω and 1,050Ω.
6. Practical Tips for Electronics Work
- Use a digital multimeter when colour bands are difficult to identify.
- Check resistor values before installing them in a circuit.
- Remember that 5-band and 6-band resistors use additional bands.
- Do not rely on colour alone if the resistor is damaged or discoloured.
Conclusion
Understanding resistor colour codes is a fundamental electronics skill. With a little practice, you can quickly identify resistor values during circuit design, troubleshooting and electronic repairs.
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