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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

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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

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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

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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%

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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…)

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7. Find the color code for the Resistance value 1.8MΩ ± 10%

8. Find the color code for the Resistance value 15KΩ ± 20%

Frequently Asked Questions ( Contd…)