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Transcript of 9 aei105.7
9AEI105.5 TO 6 1 1
Department Of Technical Education Andhra Pradesh
Name : P.S.R. Muralidhar Designation : Sr. Lecturer in ECE Branch : Electronics & Comm. EngineeringInstitute : G.M.R. Polytechnic, GajwelSemester : I YearSubject : Basic Electronics Sub. Code : AEI-105 Topic : ResistorsDuration : 100mtsSub Topic : color Coding of ResistorsTeaching aids : Diagrams, animationsRevised by : N.Venkateswerlu Lecturer in ECE
9AEI105.5 TO 6 2 2
Objectives
On completion of this class you would be able to know
• The color coding of Resistors
• How to compute the value of Resistance using the
color code
9AEI105.5 TO 6 3 3
Color Coding of Resistors
How the Resistance value is indicated on the Resistors?
• By printing its value on the body (for large size Resistors)
• By indicating its value with a color code (usual case)
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Color Coding of Resistors
What is color Coding of Resistors?
• A process through which different color bands or
rings are used to indicate the value of Resistance
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Color Coding of Resistors
What these colors indicate?
• They indicate Resistance value and also
Tolerance value
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How many color bands appear?
• Usually 3 to 4 color bands are printed on the body with
each color having a value
• They appear differently on axial and radial Resistors
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Color 1st Digit (A) 2nd Digit (B) Multiplier (C) Tolerance (D)
Black 0 0 1 - -
Brown 1 1 10 1%
Red 2 2 100 2%
Orange 3 3 1,000 3%
Yellow 4 4 10,000 4%
Green 5 5 100,000 - -
Blue 6 6 1,000,000 - -
Violet 7 7 10,000,000 - -
Gray 8 8 100,000,000 - -
White 9 9 109 - -
Gold - - - - 0.1 (EIA) - -
Silver - - - - 0.01 (EIA) - -
No Color - - - - - - 20%
color Coding of Resistors
Table -1
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color Coding on Axial Resistors
• color rings A,B,C indicate value of Resistance.
• color ring D indicates Tolerance value.
• Four (4) color rings appear on the body of axial resistors.
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Color coding on Radial Resistors
• Four (4) colors appear on the body
A – color of the Resistor body
B – a color dot
C,D – 2 color bands at the two ends
Radial Lead Dot Radial Lead Band
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Table for Resistor Color Codes
color Value Multiplier
Black 0 10° =1 Brown 1 10¹ =10
Red 2 10² Orange 3 10³ Yellow 4 104
Green 5 105
Blue 6 106
Violet 7 107
Grey 8 108
White 9 109
Gold - 0.1 Silver - 0.01
Table 2
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How to Compute Resistance Value?
• 1st color band or ring on the body
Indicates first digit of the Resistance value
• 2nd color band or ring on the body
Indicates second digit of Resistance value
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How to compute Resistance value?
• 3rd color band or ring indicates
Multiplier or the no. of zeroes after the first 2 digits
• 4th color band or ring indicates
Tolerance percentage
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Finding the Resistance Value
Example-1
• For the following color sequence, find the Resistance value along with Tolerance
Brown, Black, Red, Gold We know that the value of
Brown = 1, Black = 0, Red = 2, Gold = 5%
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Finding Resistance Value (Contd…)
The Resistance value is computed as
First Digit - 1
Second Digit - 0
Multiplier - 2 zeros after the 2nd Digit
So, the Resistance value is 1000 Ω
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Finding Resistance Value
The Tolerance percentage is 5%
Rated value = 1000 Ω, 5% of it is 50 Ω
So Tolerance = 50 Ω
So the Resistance value will be in the range of (1000 – 50) Ω to (1000 + 50) Ω,
i.e. from 950 Ω to 1050 Ω
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Example -2
• Find the Resistance and Tolerance values for the color sequence
Brown, Gray, Orange, Silver
Brown –1, Gray – 8,Orange – 3, Silver- 10%
Resistance value = 18000 Ω
Tolerance = 10% of 18000 Ω = 1800 Ω
So the Resistance range =16200 to 19800 Ω
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Example-3
• Find the Resistance and Tolerance values for the color
sequence
Red, Red, Red, No color
Red = 2
So the Resistance value is 2200 Ω
Tolerance (20%) = 440 Ω
So the Resistance range is 1760Ω to2640Ω
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Example - 4 • Find the Resistance and Tolerance values for the color sequence
Yellow, Violet, Gold, Gold
Yellow=4, Violet=7, Gold=0.1, Gold=5%
Resistance value = 47 x 0.1 = 4.7 Ω
Tolerance (5%) = 0.235 Ω
So, the Resistance = 4.465 Ω to 4.935 Ω
9AEI105.5 TO 6 19 19
To know the Color Code from the Given Resistance value
Give the color code for the following Resistance value
1 MΩ ± 10%
1 MΩ can be written as 10 x 105
So colors are Brown, Black, Green
color for 10% Tolerance is Silver
Example - 1
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Example - 2
Give the color code for the following Resistance value
4.7KΩ ± 5%
4.7KΩ can be written as 47 x 102 Ω
So the colors are Yellow, Violet, Red
Color for 5% Tolerance is Gold
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Example - 3
Give the color code for the following Resistance value
68KΩ ± 20%
The colors are Blue, Gray, Orange
Color for 20% Tolerance is No color
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band1 2 3 4 5
Color Digit Multiplier Tolerance
Black 0 0 0 x 1 ohms
Brown 1 1 1 x 10 ohms 1 1% (F)
Red 2 2 2 x 100 ohms 1 2% (G)
Orange 3 3 3 x 1K ohms
Yellow 4 4 4 x 10K ohms
Green 5 5 5 x 100K ohms 1 0.5% (D)
Blue 6 6 6 x 1M ohms 1 0.25% (C)
Violet 7 7 7 x 10M ohms 1 0.10% (B)
Grey 8 8 8 1 0.05%
White 9 9 9
Gold x 0.1 ohms 1 5% (J)
Silver x 0.01 ohms 1 10% (K)
Five Band Resistor Color Code
Digit Digit
Table-3
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Summary
• The value of resistance is indicated in Two ways
1. By printing its value
2. By using a color code
• The axial and radial Resistors are colored differently.
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Summary (Contd…)
• Each color has a predefined value
• By looking at the colors printed on the body of the
Resistor, we can know the Resistance value
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• The last color on the Resistor body indicates the
Tolerance Percentage
• Different values of Resistors are available in different
Tolerance ranges
Summary (Contd…)
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Quiz
1.Give the value for color code of red, red, red, silver bands of a resistor
(a) 220ohms,10%
(b) 2200 ohms,5%
(c) 2200 ohms,10%
(d) 22 ohms ,10%
26
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Frequently Asked Questions
1. List the ways in which Resistance value is indicated
on Resistors ?
2. How the color coding is done on the axial and radial
resistors ?
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Frequently Asked Questions ( Contd…)
3. Give the values of various colors used in color coding of Resistors.
4. Find the value of the Resistance for the following Color code.
White, Black, Blue, Gold
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5. Find the value of the Resistance for the following Color code
Gray, Red, Silver, Silver
6. Find the color code for the Resistance value 33Ω ± 5%
Frequently Asked Questions ( Contd…)