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Resistor Colour Code Calculator (4 band) Engineering Courses

The resistor color code is a system used to indicate the resistance value, tolerance, and sometimes other parameters of resistors by painting colored bands on their surface. Each color corresponds to a specific digit or value, allowing engineers, technicians, and hobbyists to quickly identify the characteristics of a resistor.

Resistor Color Code Tester

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In the standard resistor color code system:

1. First Band (Significant Digit): This band represents the first digit of the resistance value. The color of this band determines the most significant digit of the resistance value.

2. Second Band (Significant Digit): This band represents the second digit of the resistance value. The color of this band determines the least significant digit of the resistance value.

3. Third Band (Multiplier): This band indicates the multiplier or the number of zeros to add to the significant digits. It scales the resistance value by a power of 10.

5. Fourth Band (Tolerance): If present, this band denotes the tolerance or the maximum variation in ohms from the specified resistance value. It indicates the resistor's precision or how closely its actual resistance matches its stated value.

Fifth Band (Temperature Coefficient): Some precision resistors may have a fifth band to indicate the temperature coefficient, describing how the resistance changes with temperature.

Here are the standard colors used in the resistor color code system and their corresponding values:

  • Black: 0
  • Brown: 1
  • Red: 2
  • Orange: 3
  • Yellow: 4
  • Green: 5
  • Blue: 6
  • Violet: 7
  • Gray: 8
  • White: 9
In addition, gold (±5%) and silver (±10%) are commonly used for the tolerance band. Some resistors may also have non-standard color codes for special purposes or features.

By interpreting the colors of these bands, one can determine the resistance value of the resistor. The resistor color code system is widely used in electronics for identifying and working with resistors in various circuits and applications.

How to read resistor color code 


Finding the resistor color code involves identifying the color bands painted on the surface of the resistor and interpreting them to determine the resistance value, tolerance, and possibly other parameters. Here's a step-by-step guide on how to find and decode the resistor color code:

1. Identify the Color Bands:
   Examine the resistor closely and locate the colored bands. Most resistors have either four or five-color bands, but some may have only three.

2. Determine the Band Positions:
   Typically, the bands are located close to one end of the resistor. The first two bands are usually closer together, followed by a gap, and then the third and, if present, the fourth and fifth bands.

3. Decode the Bands:
   Each color represents a specific digit or value. Use a resistor color code chart or table to match the colors to their corresponding values. Here's what each band represents:

First Band (Significant Digit): This band represents the first digit of the resistance value.
Second Band (Significant Digit): This band represents the second digit of the resistance value.

Third Band (Multiplier): This band indicates the multiplier or the number of zeros to add to the significant digits.

Fourth Band (Tolerance): If present, this band denotes the tolerance or the maximum variation in ohms from the specified resistance value.

Fifth Band (Temperature Coefficient): Some resistors may have a fifth band to indicate the temperature coefficient, describing how the resistance changes with temperature.

4. Calculate the Resistance Value:
   Once you've identified the colors of the first three bands, use them to calculate the resistance value. The formula is:

Resistance=(First Digit×10+Second Digit)×Multiplier

For example, if the first two bands are red (2) and violet (7), and the third band is orange (10^3), the resistance value would be
(2×10+7)×10^3 =270 kΩ.

5. Check Tolerance (Optional):
   If there's a fourth band indicating tolerance, determine the tolerance value based on its color. Common tolerance values include ±5% (gold) and ±10% (silver).

6. Verify the Result:
   Double-check your calculations and make sure they match the colors of the bands on the resistor. If you're uncertain, consult a resistor color code chart or use a multimeter to measure the resistance directly.

By following these steps, you can effectively find and decode the resistor color code to determine its resistance value and other parameters. Practice and familiarity with the color code system will improve your ability to identify resistors accurately.

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Its me, Himanshu Khare Author Founder of educational site Learningyouth.com. I have strong experience in blogging and SEO.

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