# Differences

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iot:res:resistors [2015/06/22 17:32] (current)
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+====== 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 |}}