Lesson plan

RKM code

The RKM code is a notation for the specification of resistors and capacitors, defined since 1968 by the International Electrotechnical Commission (IEC) in its standard IEC 60062 (formerly IEC 62) possibly adopting a previous engineering practice. It is also referred to as "letter and numeral code for resistance and capacitance values and tolerances", "letter and digit code for resistance and capacitance values and tolerances", or informally as "R notation". Corresponding national standards include DIN 40825 (1973) of the Deutsches Institut für Normung, BS 1852 (1975) of British Standards Institution, and IS 8186 (1976) of the Bureau of Indian Standards; as well as the pan-European EN 60062 (1993) of the European Standards Organizations. The updated IEC 60062:2016, amended in 2019, comprises the most recent release of the standard.

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Article summary

The RKM code is a notation for the specification of resistors and capacitors, defined since 1968 by the International Electrotechnical Commission (IEC) in its standard IEC 60062 (formerly IEC 62) possibly adopting a previous engineering practice. It is also referred to as "letter and numeral code for resistance and capacitance values and tolerances", "letter and digit code for resistance and capacitance values and tolerances", or informally as "R notation". Corresponding national standards include DIN 40825 (1973) of the Deutsches Institut für Normung, BS 1852 (1975) of British Standards Institution, and IS 8186 (1976) of the Bureau of Indian Standards; as well as the pan-European EN 60062 (1993) of the European Standards Organizations. The updated IEC 60062:2016, amended in 2019, comprises the most recent release of the standard.

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  1. Summarise the article in your own words. Which single claim would you verify first, and why?
  2. Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
  3. If two sources disagreed about one of these facts, what would you need in order to trust one over the other?

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