The colour coding on a carbon resistor is shown in the given figure. The resistance value of the given resistor is:
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A colour code is used to indicate the resistance value of a carbon resistor and its percentage accuracy.
| Colour | Letter as an aid to memory | Number | Multiplier | Colour | Tolerance |
| Black | B | 0 | 100 | Gold | 5% |
| Brown | B | 1 | 101 | Silver | 10% |
| Red | R | 2 | 102 | No fourth band | 20% |
| Orange | O | 3 | 103 | ||
| Yellow | Y | 4 | 104 | ||
| Green | G | 5 | 105 | ||
| Blue | B | 6 | 106 | ||
| Violet | V | 7 | 107 | ||
| Grey | G | 8 | 108 | ||
| White | W | 9 | 109 |
A set of coloured co-axial rings or bands is printed on the resistor which reveals the following facts :
1. The first band indicates the first significant figure.
2. The second band indicates the second significant figure.
3. The third band indicates the power of ten with which the above two significant figures must be multiplied to get the resistance value in ohms.
4. The fourth band indicates the tolerance or possible variation in percent of the indicated value. If the fourth band is absent, it implies a tolerance of ± 20%
R = (7500 ± 375)
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