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These standard resistor values have a logarithmically based sequence and this enables the different values to be spaced in such a way that they relate to the component tolerance or accuracy. Other types of electrical components are either specified by the Renard series for example fuses or are defined in relevant product standards for example IEC for wires. Views Read Edit View history. Resistor E series The EIA preferred values or standard resistor values can be summarised in a tabular reieh to give the different values within each decade.
The EIA Electrical Industries Association which is based in North America is one organisation that has adopted the system and as a result the resistor value series are often referred to as the EIA standard resistor values. Wikimedia Commons has media related to E12 values.
E12 Standard Resistor Series 1. The EIA “E” series specify the rekhe values for various tolerances. This allows easier purchasing migration between different tolerance parts.
Standard Resistor Values | E3 E6 E12, E24, E48 Series | Electronics Notes
The table below is normalized for the decade between and 1, The exact value is of little is of little consequence and the value can be maintained within the E3 series.
Later, the post—World War II baby boom and the invention of the transistor kicked off demand for consumer electronics goods during the s. E3 Standard Resistor Series 1. The series are as follows: Take then a resistor with a value of 1. It consists of the E3E6E12E24E48E96 and E series, where the number after the ‘E’ designates the quantity of value “steps” in each series. Often designs try to keep to the E3 or E6 standard resistor values, only using those in the E12, E24, E48 or E96 if absolutely necessary.
The number following the “E” specifies the number of logarithmic steps per decade. Below are the common resistor values. The E series preferred or standard resistor value ranges are internationally accepted and have been adopted by international standards organisations.
Resistor E series tables of values Below are the common reieh values. Commons category link is on Wikidata Commons category link is on Wikidata using P Retrieved from ” https: The Electronic Industries Association EIAand other authorities, reiihe standard values for resistors, sometimes referred to as the “preferred value” system.
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E6 Standard Resistor Series 1. The preferred value system has its origins in the early years of the last century at a time when most resistors were carbon-graphite with relatively poor manufacturing tolerances. This page was last edited on 1 Novemberat The E96 and E series of standard resistor values also exist, but their use is much smaller than those in the other ranges given above. The E6 series resistor values are also widely used within the industry. It reduces the number of different types of resistor used in a design and this simplifies purchasing and manufacturing processes.
By having these standard resistor values, components from a variety of manufacturers can be chosen, making sourcing much easier and the cost of the components much less.
E series of preferred numbers – Wikipedia
Over time, components evolved towards common values, then based on some of these existing conventions, the International Electrotechnical Commission IEC began work on an international standard in The two main differences between each major group is the number of significant digits 2 digits for E3 to E24, 3 digits for E48 to E and different rounding rules. This process is followed through for all the values in a decade, creating a set of standard resistor values for each tolerance.
The different sets of standard resistor values are known by their E-series numbers: World War II military production was a major influence for establishing common standards across many industries.
It should be noted that some values in the E24 series don’t exist in E48 to E series.
The resistance of this component at the bottom of its tolerance band is 1. The standard reiye values are organised into a set of series of values known as the E-series. Also, the E series is used for 0.
E3 has three resistors in each decade, E6 has six, E12 has twelve, and so forth.
The E3 series resistors are the most widely used and hence these values will be the most common resistor values used within the electronics industry. List of International Electrotechnical Commission standards.