Resistors use various color bands to specify their values. These color bands are used instead of numbers due to their simplicity and cost effective printing on tiny components.
Color
| Value | Tolarance | |
|---|---|---|---|
| Pink | -3 |
-
|
|
| Silver | -2 | ±10% | |
| Gold | -1 | ±5% | |
| Black | 0 | - | |
| Brown | 1 | ±1% | |
| Red | 2 | ±2% | |
| Orange | 3 | - | |
| Yellow | 4 | ±5% | |
| Green | 5 | ±0.5% | |
| Blue | 6 | ±0.25% | |
| Violet | 7 | ±0.1% | |
| Grey | 8 | ±0.05% | |
| White | 9 | - | |
- The resistance is determined by using the color values counted from left to right.
- To distinguish the left and right ends there will be a gap between the last two color bands i.e. on the right end.
- The last color band on the extreme right indicates only the tolerance value and its color value is not counted.
- The second from the right end indicates the multiplier value in the order of X10n. where n is the value of that color code.
- The values of the remaining color bands are noted in the order as they are on the resistor before the multiplier.
The following section shows the calculation of resistance using sample resistors.
Calculation of Resistance using Color codes
Consider the following two resistors to understand the concept of color coding for resistors
 |
| Resistor |
The above resistor has 4 color bands and the last band stands for tolerance of ±5%. The color codes of the remaining bands are 1-5-2.
Hence the value of the above resistor is 15x102 ±5%=1500 ±5% ohm.
Similarly the below resistor has 5 color bands whose color values are 2-2-0-1- ±10%.
The value of the resistance is 220x101±10%=2200±10% ohm
 |
| Resistor |
Further on:
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