
Resistor color codes are used to represent the resistance value of resistors. Here’s a quick guide to decoding them:
- Color Bands: Resistors typically have four or five color bands. Each band represents a digit or a multiplier.
- First Band (1st Significant Digit):
- The first band represents the first significant digit of the resistance
- Color to Digit Mapping:
- Black: 0
- Brown: 1
- Red: 2
- Orange: 3
- Yellow: 4
- Green: 5
- Blue: 6
- Violet/Purple: 7
- Gray: 8
- White: 9
- Second Band (2nd Significant Digit):
- The second band represents the second significant digit of the resistance
- Third Band (Multiplier):
- The third band represents the multiplier, which tells you how many zeros to add to the two significant digits.
- Color to Multiplier Mapping:
- Black: 1
- Brown: 10
- Red: 100
- Orange: 1,000
- Yellow: 10,000
- Green: 100,000
- Blue: 1,000,000
- Violet/Purple: 10,000,000
- Gray: (some use 0.01, others use 0.1)
- White: (some use 0.001, others use 0.01)
- Fourth Band (Tolerance):
- The fourth band represents the tolerance, which indicates the percentage range within which the actual resistance may vary.
- Color to Tolerance Mapping:
- Brown: ±1%
- Red: ±2%
- Green: ±0.5%
- Blue: ±0.25%
- Violet/Purple: ±0.1%
- Gray: ±0.05%
- Gold: ±5%
- Silver: ±10%
- Fifth Band (Temperature Coefficient – Optional):
- Some resistors have a fifth band, which represents the temperature coefficient. It indicates how much the resistance will change with temperature.
- Color to Temperature Coefficient Mapping:
- Brown: 100 ppm/°C
- Red: 50 ppm/°C
- Orange: 15 ppm/°C
- Yellow: 25 ppm/°C
Example:
- Let’s say you have a resistor with the colors: Red, Violet, Green, Gold.
- The first digit is 2 (Red), the second digit is 7 (Violet), the multiplier is 100,000 (Green), and the tolerance is ±5% (Gold).
- So, the resistance is 27 * 100,000 ohms with a tolerance of ±5%.
Remember, this is a basic guide. Some resistors may have additional bands for special purposes.
Written by kanchan kan
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