Advances in printing technology have now made printed numbers more practical on small components. Overheating of a component or dirt accumulation may make it impossible to distinguish brown from red or orange. However, there were drawbacks, especially for color blind people.
20 ohm resistor color code code#
In addition to the color code, these standards define a letter and digit code named RKM code for resistors and capacitors.Ĭolor bands were used because they were easily and cheaply printed on tiny components.
The current international standard defining marking codes for resistors and capacitors is IEC 60062:2016 and EN 60062:2016. Originally only meant to be used for fixed resistors, the color code was extended to also cover capacitors with IEC 62:1968. In 1952, it was standardized in IEC 62:1952 by the International Electrotechnical Commission (IEC) and since 1963 also published as EIA RS-279.
Though known most recently as EIA color code, the four name variations are found in books, magazines, catalogs, and other documents over more than 91 years. Over many decades, as the organization name changed (RMA, RTMA, RETMA, EIA) so was the name of the code. In 1930, the first radios with RMA color-coded resistors were built. In the 1920s, the RMA resistor color code was developed by the Radio Manufacturers Association (RMA) as a fixed resistor coloring code marking. 1945–1950īefore industry standards were established, each manufacturer used their own unique system for color coding or marking their components.
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