Resistor Color Code

  

In a previous article, we have seen the basics information about resistors with their colour bands.

Each resistor has a specific resistance value as per designing colour band. And it depends upon the colour code/band printed on the resistor.

Before using any resistor in an electronic circuit, you need to find out the first resistance value of the resistor.

Resistor Color Code Information The resistor color code is a long standing standard in both the electronics and electrical industries, indicating the value of resistance of a resistor. Resistance is measured in ohms and there is a foundation for it called Ohm's Law. (Want to know about Ohm's Law? If so, please click here or click here!)Each color band represents a number and the order of the.

Let’s see in details,

IRC Resistor Color Code This chart from International Resistance Company (better known as IRC) shows the resistance color markings for their early 'Dog Bone' resistors. The card is one sided. No date is marked on the chart but these type of resistors were used in radio construction from the 1920s through the mid 1930s. Size: 3¼' X 6¾' Larger. The 4-band resistor color code is the most commonly used resistor. Similar to the 3 band resistor, the first two bands always give the first 2 digits of the resistance value. The third band represents the multiplier while the fourth band represents tolerance.

How to calculate Resistance using colour code?

The colour bands on the resistor are used to identify the value and tolerance or resistance.

The power rating of the resistor depends upon the physical size of the resistor.

We consider as, a resistor consists of four different color bands (A, B, C, and D printed on the resistor body) as shown in the below figure.

Resistor color code 2k

The first of three different colour band (A, B, C) shows a different value of resistance. And the last band (D) shows the tolerance of resistance in percentage.

Resistor color code 3

Firstly, you should refer the resistor colour band table given below.

Note: I know, it is not easy to remember the value corresponding to each color band. You can use this simple phrase to remember the sequence color band and its values.

Here, each band position and its colour has specific significance to calculate resistance value.

Band A: A first colour band (A) represents the first digit of the numerical value of the resistance. (Says x)

Band B: The second colour band (B) represents the second digit of the numerical value of resistance. (Says y)

Band C: Third colour band (C) is the decimal multiplier and gives the number of zero after two digits. (Says z)

Band D: The fourth band (D) or last band shows the tolerance in percentage (%). (Says p)

Resistor

So the final formula you can use to calculate resistance:

Example of Resistor Colour Code:

Consider, a resistor is having four different colour bands red, brown, orange, and gold respectively as shown in the below diagram.

Firstly choose the value of colour from the table.

First Step:

The Red band of the resistance value is 2 and the brown band of the resistance value is 1 from the table.

The first two digits of the band show the value of resistance 2 and 1 i.e. 21

Second Step:

From the table, the third orange band has value 1000. Multiply this value to 21 i.e. 21×1000=21000 Ω.

Third Step:

Color

Last is the Gold band having tolerance value in 5% (0.05) from the table. The 5% tolerance resistor may have a maximum and minimum value of resistance.

  • for maximum resistance value, 21kΩ or 21000Ω + 5% = 22,050Ω
  • for manimum resistance value, 21kΩ or 21000Ω – 5% = 19,950Ω
Resistor Color Code

Finally, we get the final value of resistance is in the range of 22,050 to 19,950 Ω.

Once you know to calculate resistance using colour Code of resistors, it will be easy for you to design and using resistors in the electronics circuit.

If you have any queries, you can hit the comment in given comment.

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Thanks for Reading!

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I have completed master in Electrical Power System. I work and write technical tutorials on the PLC, MATLAB programming, and Electrical on DipsLab.com portal.

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