The unique explanation behind the values of electronic components like resistors, capacitors, zener diodes, and inductors lie in the concept of preferred numbers, originating from the French military in 1877. This led to the development of the “Renard numbers,” which later became the basis for the E-series and ISO standards for electronic components. The E-series values assign specific values with error tolerances, with E6 being the basic set and E192 having the smallest tolerances. By understanding these series, one can easily determine component values for various circuit requirements by combining preferred numbers. Overall, having knowledge of these standards simplifies electronic design and selection processes.
https://digilent.com/blog/why-do-electronic-components-have-such-odd-values/