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Electric Current: Resistors Color Code

Grade 9
Aug 22, 2022

Key Concepts

  • 3 brand resistor
  • 4 brand resistor
  • 5 brand resistor


Electrical appliances are connected to the same voltage, but different current flows in the circuit. Different resistors are placed in the circuits, which offer different resistances to the flow of electrons. In this section, we are going to observe these different resistors and calculate their resistance.  



A resistor has a band on it, which can be used to calculate its resistance. It can be three, four, five or six bands. Based on the bands on the resistor, its resistance can be calculated. This resistance of that resistor is fixed. 

Its SI unit is Ohm. 

Following is the table with color code of resistors. 

GD: Make this in the form of a table with each color’s name as the row’s color.  


Following is the table with the tolerance of resistors.

GD: Make this in the form of a table with each color’s name as the row’s color.

Calculation (in four band resistor):

First band is the first digit of resistance.

Second band is the second digit of resistance.


Third band represents the multiplier of resistance.

Fourth band represents the percentage of accuracy between the indicated value and the actual value.

3 band resistor 
4 band resistor
5 band resistor

Questions and answers 

Question 1: Match the following

Question 1 figure 


Answer 1 figure 

Question 2:  Calculate the resistance, minimum resistance and maximum resistance of this resistor.

 Question 2 figure 


Resistance= 6.4 GΩ ±0.5% 

Minimum resistance = 6.368 GΩ  

Maximum resistance = 6.432 GΩ 


  • Resistor has 3, 4,5 or 6 color band.
  • Color code:
  1. First band is the first digit
  2. Second band is the second digit
  3. Third band is the multiplier
  4. Fourth band is the tolerance.
  • Standard color associates each color with a specific decimal digit (0-9)


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