Electricity & Megnetism

Resistor color code

Through a color code, it is possible to determine the resistance of resistors based on the interpretation of the color bands recorded in these devices.

Color coding allows you to read the resistance of a resistor

Widely used in electronic circuits , resistors made of carbon have varying resistances, which are identified by a color code.
The electrical resistance value can be printed on the resistor body or indicated by means of colored bands. These ranges correspond to a code that allows you to determine the resistance value of the resistor.

This color code follows the following numerical order:

COLOR Black Brown Red Orange Yellow Green Blue Violet Grey White
DIGIT 0  1 two 3 4 5 6 7


8 9

The reading of these strips must always be done from the end to the center, according to the following criteria:

1st range: (closest to the end) indicates the first digit of theresistance;

2nd band : indicates the second digit of theresistance.

3rd band : indicates the number of zeros that must be added to the two previous digits.

There may also be a 4th band to indicate the inaccuracy or tolerance of the resistance value .

In that case:

  1. If the 4th band is silver, it indicates that the inaccuracy is10%;
  2. If golden, it indicates that the inaccuracy is5%.
  3. If the 4th band does not exist, a tolerance of 20%in the resistance valueis assumed, up or down.

See an example:

The resistance value is R = 2,700,000 Ω, with a tolerance of 5% , plus or minus.

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