Resistors

How to read the color codes of the resistors and tips. (6/25/2006)

 

As the name indicates, a resistor is a resistance for al electrical circuit. There is two ways to determine the value of a resistance: by formula or by value.

 

To determine the resistance in a circuit, we need to know the value of the voltage (V) and the current (I), so the resistance = voltage / current ( R = V / I )

 

Another wat to know the value, is just reading the value. Some values are color coded, others are marked. Usually, resistors have four colored strips. Some precision resistors have five.

 

To identify the value of the resistor, you need to know and learn the value of each color to identify it.

 

Color Code

COLOR
BLACK
BROWN
RED
ORANGE
YELLOW
GREEN
BLUE
VIOLET
GRAY
WHITE
1st
0
1
2
3
4
5
6
7
8
9
2nd
0
1
2
3
4
5
6
7
8
9
3rd (Multiplier)
x 1
x 10
x 100
x 1,000
x 10,000
x 100,000
x 1,000,000
x 10,000,000
x 100,000,000
x 1000,000,000

 

Tolerance: 4th band
Gold +-%5, Silver +-10%, no color: +-20%

 

resistor Using the previous table, we can read the value of this resistor: Red, Red, Orange, Gold. That means: 2, 2, x 1,000, +-5%.

 

So, we obtain: 22,000 +-5%. This is a 22K resistor with +-5% tolerance. The tolerance means the precision. 5% of 22,000 so this resistor may have 20,900 ohms or 23,100 ohms.

 

surface mount resistors The surface mount resistors are easy to read, it should have three digits, the first one is the first digit, the second one is the second digit and the third one is the multiplier, so the resistors on this picture are 2.2K, 2.2K and 91K

 


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