Electronic components like resistors are very small in size and it’s difficult to print their value directly onto the component surface. In the case of resistors, color coding is used to identify a specific resistance value, for example, a 100 ohms resistor or a 1-kilo ohms resistor with 5% tolerance. “Color coding” is used in electronics to identify between different components. The color-coding technique makes it easy to print values (based on color codes) on small components, such as resistors and facilitates cost-effective manufacturing. Hence a standard was formed in 1920 by the Radio Manufacturers Association (now part of EIA – Electronic Industries Alliance) to identify values and ratings of electronic components by printing color codes on them.įor example a 100 ohms resistor or a 1-kilo ohms resistor with 5% tolerance. But for small rating resistors say 0.25 W resistors are very small in size and it’s difficult to print its value directly onto the component surface.
With these color bands, we can identify the resistive value and its percentage tolerance of a resistor.įor large power resistors, the resistor body is big enough to print the resistance value, tolerance, and wattage rating on them. These color bands indicate the values of those resistors like the identity card does for us. A look into the electronic circuit board mostly shows wires with colorful bands, called resistors.
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