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Standard resistor values (Electronic)

Resistors are sold with fixed values, that is standard ones. There are many series called E3, E6, E12, E21, E48, E96 and E192. Base value for an Ex serie are Ri=10^(i/x) for i between 0 and x-1. Then, a serie contains all the multiple by 10 of this base serie.

For exemple, the E12 serie (the most known) is constitued by values 10, 12, 15, 18, 22, 27, 33, 39, 47, 56, 68 et 82 Ohm, decaOhm, hectoOhm, kiloOhm, 10^4Ohm...

We must remark that E3 to E24 serie have only 2 significant digits but after that, we must consider 3 digits.

The following table gives base value for E12 and E24 series.

E12 serie
10

12

15

18

22

27

33

39

47

56

68

82

E24 serie
10
11
12
13
15
16
18
20
22
24
27
30
33
36
39
43
47
51
56
62
68
75
82
91

E12 serie	10		12		15		18		22		27		33		39		47		56		68		82
E24 serie	10	11	12	13	15	16	18	20	22	24	27	30	33	36	39	43	47	51	56	62	68	75	82	91