When you see only three color bands on a resistor, you know that it is actually a 4-band code with a blank (20%) tolerance band. Example: 3Ī resistor colored White-Violet-Black would be 97 Ω with a tolerance of +/- 20%. Here we have a resistor colored Green-Red-Gold-Silver, which would be 5.2 Ω with a tolerance of +/- 10%. This equates to 47 kΩ with a tolerance of +/- 5%. In this picture, you will see it colored Yellow-Violet-Orange-Gold. The blank (20%) “band” is only used with the “4-band” code (3 colored bands + a blank “band”). What are tolerance codes?Ĭolours on the resistor like brown, red, green, blue, and violet are used as tolerance codes on 5-band resistors only. By matching the color of the first band with its associated number in the digit column of the color chart below the first digit is identified and this represents the first digit of the resistance value. The resistor color code markings are always read one band at a time starting from the left to the right, with the larger width tolerance band oriented to the right side indicating its tolerance. It consists of a set of individual colored rings or bands in spectral order representing each digit of the resistors value. An international resistor color code scheme was developed many years ago as a simple and quick way of identifying a resistor’s ohmic value no matter what its size or condition.
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