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Electronics

Color code

Color code table

Color code for resistors
4-Band Resistor.svg1 st
ring
left
2 e
ring
left
3 e
ring
left *
Last left
ring

Straight ring

Additional ring
Abbrev.
Color 1 st digit 2 e figure 3 E digit Multiplier Tolerance Coefficient. temp. Alpha.
  black 0 0 0 10 0 = 1   200 ppm BK
  Brown 1 1 1 10 1 ± 1% 100 ppm BN
  red 2 2 2 10 2 ± 2% 50 ppm RD
  orange 3 3 3 10 3   25 ppm OG
  yellow 4 4 4 10 4   15 ppm YE
  green 5 5 5 10 5 ± 0.5%   GN
  blue 6 6 6 10 6 ± 0.25%   DRANK
  purple 7 7 7 10 7 ± 0.10%   VT
  Grey 8 8 8 10 8 ± 0.05%   GY
  White 9 9 9 10 9     WH
  gold       0.1 ± 5%   GD
  silver       0.01 ± 10%   SR
  (absent)         ± 20%    

* The third ring is only used when the resistance tolerance is less than 2%.

Identification of standard film resistors

The value of standard resistors is usually indicated on the component in the form of colored rings.

  • Commonly 4 rings appear:
  1. The first is the one that is placed closest to one end.
  2. The first two (or the first three) indicate two digits (one digit corresponding to a color).
  3. The penultimate (third, sometimes fourth) indicates a multiplication factor of the number formed by the first two.
  4. The last (fourth, sometimes fifth) indicates the error tolerance or precision. Indeed, like many electronic components, due to their manufacturing technique and for economic considerations, the resistors are not very precisely calibrated. This ring is sometimes further spaced from the previous ones. He is not always present, his absence signifying the loosest tolerance of 20%.
  • Sometimes an additional ring is coded for precision resistors, indicating a resistance growth coefficient as a function of temperature (in ppm / kelvin).
  • Depending on the applications, a series with different precision characteristics will be used. The possible percentages plus or minus the value of R range from 20% to 0.05%. The resistor's sell price is inversely proportional to its accuracy.
  • The colors used for the marking of resistance values, arranged in ascending order of value starting from zero are:
      • 0 = Black, 1 = Brown or Brown, 2 = Red, 3 = Orange, 4 = Yellow, 5 = Green, 6 = Blue, 7 = Purple, 8 = Gray, 9 = White.

    Example of identification using the color code of the resistors:

    image of resistanceYellow, Purple, Orange, Gold translates to 47,000 Ω (or 47 kΩ ) accuracy 5%.

Content subject to CC-BY-SA license .
Source : Article CEI 60757 from Wikipedia in French ( authors )

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