The Resistor is covered with plastic coat with different color coated is called as color coding. Each and every color coated on the resistor insists the range of resistance in it.
Lets us see the value for each color on the resistor:
The plastic coat of the resistor may consists of
 |
| Resistance with color coding |
The plastic coat of the resistor may consists of
- Black
- Brown
- Red
- Orange
- Yellow
- Green
- Blue
- Violet
- Grey
- White
- Gold
- Silver
 |
| Resistor Color Values |
In this color starting from Black to White will available in 1st to 3rd digit and it implies the numerical value where as Gold and Silver will always appear as tolerance. The colors with their ranges are given in Resistor Color values.
There are different number of band available in resistor. It starts from 3 band to 5 band.
How to Calculate Resistance:
The calculation of resistance starts from right to left. The first and second digit of color will take numerical values. Where as third digit will take multiplier and fourth digit will take tolerance.
3 band resistor:
Example 1: |
| 3-Band Resistor |
In this diagram, 1st digit- Brown
2nd digit- Black
3rd digit - Black
According to color chart:
1 st digit - Brown - 1
2nd digit- Black - 0
3rd digit - Black- Multiplier- x 1
hence 10x1= 10 ohms
4 Band Resistor:
Example 2:
In this the first band is green, second band is sky blue, multiplier is orange and tolerance is gold.
 |
| 4 Band Resistor |
First band - Green - 5
Second Band- Sky blue- 6
Multiplier - Orange - x 1000
Tolerance - Gold - +/- 5%
hence 56x1000 =56000 +/-5% or 56 kilo ohm +/- 5%
hence 56x1000 =56000 +/-5% or 56 kilo ohm +/- 5%
5 Band Resistor:
Example 3:
In this first digit is Brown, Second and third digit is Black, Multiplier is silver and tolerance is brown
 |
| 5 Band Resistor |
First band - Brown - 1
Second Band- Black- 0
Third Band - Black - 0
Third Band - Black - 0
Multiplier - Silver- x 0.1
Tolerance - Brown - +/-1%
hence, 100x0.1= 10 ohms +/-1%
hence, 100x0.1= 10 ohms +/-1%
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