A resistor is an electrical component that opposes the flow of current. We all have seen different resistors used in the circuits. But have you noticed that there are some colour bands on the resistor? What they indicate?
Actually, Resistors are coded are with colours to identify their value and function. There are different resistors depending upon a number of colour bands on it. Such as 3 band, 4 band , and 5 band resistor. Using the following table, you can easily tell the resistor value.

Colour
Digit
Multiplier
Tolerance (%)
Black
0
100
Brown
1
101
1
Red
2
102
2
Orange
3
103
Yellow
4
104
Green
5
105
0.5
Blue
6
106
0.25
Violet
7
107
0.1
Grey
8
108
White
9
109
Gold
10-1
5
Silver
10-2
10
None
20

(a). 4-Band Resistor

The first two bands are digit values from column-2 of above table. The third band give multiplier value from column-3. The fourth band give tolerance value from column-4.
Examples:
1. 
This resistor is coloured as Yellow-Violet-Orange-Gold 
Resistance = 47 kΩ with a tolerance of ± 5%.
2. 
This resistor is coloured as Green-Red-Gold-Silver
Resistance = 5.2 Ω with a tolerance of ± 10%.
3. 
This resistor is coloured as White-Violet-Black

Note: There are only three bands in this resistor. So to calculate resistance, fourth band’s tolerance is taken as 20%.
Resistance = 97 Ω  with a tolerance of ± 20%.
(b). 5-Band Resistor

The first three bands are digit values from column-2 of above table. The fourth band give multiplier value from column-3. The fifth band give tolerance value from column-4.

Examples: 

1.

This resistor is coloured as Orange-Orange-Black-Brown-Violet
Resistance = 3.3 kΩ with a tolerance of ± 0.1%.
2. 
This resistor is coloured as Brown-Green-Grey-Silver-Red
Resistance = 1.58 Ω with a tolerance of ± 2%.
3. 
This resistor is coloured as Blue-Brown-Green-Silver-Blue
Resistance = 6.15 Ω with a tolerance of ± 0.25%.
So this is how you can easily tell resistor value by viewing different colour bands printed on the resistor.
Resistor Color Codes

Leave a Reply

Your email address will not be published. Required fields are marked *

error: Content is protected !!