The E series is a system of preferred numbers (also called preferred values) derived for use in electronic components. It consists of the E3, E6, E12, E24, E48, E96 and E192 series, [1] where the number after the 'E' designates the quantity of logarithmic value "steps" per decade.

The E12 series has twelve values or steps per decade and hence provides better precision as compared to both the E3 and E6 series. The values per decade in the E12 series are – 1.0, 1.2, 1.5, 1.8, 2.2, 2.7, 3.3, 3.9, 4.7, 5.6, 6.8, and 8.2.

Complete list of the standardized E12 resistor series.

Following this logic, the preferred values for 10% tolerance resistors between 100 and 1,000 ohms would be 100, 120, 150, 180, 220, 270, 330 and so on (rounded appropriately); this is the E12 series shown in the table below. The EIA "E" series specify the preferred values for …

Explore the E12 series of resistors: their standard values, 10% tolerance, color codes, and how they're used in everyday electronics. Find practical tips and comparisons with other resistor series.

In industrial design, preferred numbers (also called preferred values or preferred series) are standard guidelines for choosing exact product dimensions within a given set of constraints. Product developers must choose numerous lengths, distances, diameters, volumes, and other characteristic quantities.

E12 series resistors. In the E12 series each succeeding resistor falls within the -/+ 10 % of the previous value. Until fairly recently, 10% tolerance resistors were the norm, but today, 5% (E24) resistors seem to be the most commonly used. They still can be found in vintage radios, old amplifiers, etc., but the price of a 5% resistor is low ...

While the E12 series is the most common, other series are also available. It is a good practice to specify resistors from a low series when tolerance requirements are not high. The most common series are: E6 20% tolerance; E12 10%; E24 5% (also available with 1%) E48 2%; E96 1%; E192 0.5% (also used for resistors with 0.25% and 0.1%).

The E12 series is so called because 12 ‘Preferred Values’ of resistor, each having a tolerance range of +/-10% covers all values from 10Ω to 100Ω. This range of values is called a decade, and the next higher range (decade) in the E12 series covers values between 90Ω (100Ω -10%) and 902Ω (820Ω +10%) and so on.

The E12 series is a standard series of preferred numbers. It is used throughout electronics to provide preferred values for resistors and capacitors. Specifically, the E12 series provides 12 values for each decade of variation in component values. For resistors, this …