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iot:res:resistors [2015/06/22 17:32] (current)
madalina.tanea created
Line 1: Line 1:
 +====== Resistor Color Code ======
  
 +
 +Every resistor has colored bands. Those bands and colors are not random at all, they help to identify the specifications of the resistor.
 +
 +Here is how you can see the value of a resistor depending on its colored bands. ​
 +
 +Every color represents a different number.
 +
 +Here is the table of all the colors and numbers:
 +^ Color ^ Number ^
 +|Black | 0 |
 +|Brown | 1 |
 +|Red | 2 |
 +|Orange | 3 |
 +|Yellow | 4 |
 +|Green | 5 |
 +|Blue | 6 |
 +|Violet | 7 |
 +|Grey | 8 |
 +|White | 9 |
 +
 +
 +Counting from right to left, the second color is the multiplier. Digits of the first colors must be multiplied with the number of this color.
 +
 +^Color ^Multiplier ^
 +|Black | 1  |
 +|Brown | 10 |
 +|Red | 100 |
 +|Orange | 1000 |
 +|Yellow | 10000 |
 +|Green | 100000 |
 +|Blue | 1000000 |
 +|Gold | 0.1 |
 +|Silver | 0.01 |
 +And the last color is the tolerance. Tolerance is the precision of the resistor and it is a percentage.
 +^Color ^Tolerance ^
 +|Brown | 1 |
 +|Red | 2 |
 +|Gold | 5 |
 +|Silver | 10 |
 +|Nothing | 20 |
 +
 +There are a lot of programs that can calculate the value of a resistor but if you do not have access to the Internet and you need to know a certain value you can use the table from the next figure.
 +
 +{{ :​iot:​res:​resistor.jpg?​300 |}}
 +
 +** Examples: **
 +
 +1.Yellow and green represent 4 and respectively 5. They represent the first and second digits, so you will have 45.
 +The third band is orange. As a multiplier, it is x 1000, so you will calculate 45 x 1000 thus, the resistance is 45,000 Ω.
 +The forth band, silver, represents the tolerance, so the final expression of the resistance is 45,000 +/- 10%Ω. ​
 +{{ :​iot:​res:​resistex.jpg?​300 |}}
 +2. A resistor colored Orange-Orange-Black-Brown-Violet would be 3.3 k$\Omega$ with a tolerance of +/- 0.1%.
 +{{ :​iot:​res:​resistor_image.png?​300 |}}
iot/res/resistors.txt · Last modified: 2015/06/22 17:32 by madalina.tanea
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