Inst ToolsInst ToolsInst Tools
  • Ask
  • Courses
  • Videos
  • Q & A
    • Interview
      • Instrumentation
      • Electronics
      • Electrical
      • Practical Questions
    • MCQ
      • Instrumentation MCQ
      • Electrical MCQ
      • Electronics MCQ
      • Control Systems MCQ
      • Analog Electronics MCQ
      • Digital Electronics MCQ
      • Power Electronics MCQ
      • Microprocessor MCQ
      • Multiple Choice Questions
  • EE
    • Electronics
      • Electronics Q & A
      • Electronic Basics
      • Electronic Devices & Circuits
      • Electronics Animation
      • Digital Electronics
    • Electrical
      • Electrical Basics
      • Electrical Q & A
      • Power Electronics
      • Electrical Machines
      • Electrical Animation
      • Power Systems
      • Switchgear & Protection
      • Transmission & Distribution
  • Measure
    • Control Valves
    • Calibration
    • Temperature
    • Pressure
    • Flow
    • Level
    • Analyzers
    • Switches
    • Vibration
    • Solenoid Valve
  • Control
    • PLC Tutorials
    • Control Systems
    • Safety Instrumented System (SIS)
    • Communication
    • Fire & Gas System
  • More
    • Design
    • Tools
    • Animation
    • Basics
    • Formulas
    • Standards
    • TextBooks
    • Common
    • Software
    • Excel Tools
    • Erection & Commissioning
    • Process Fundamentals
    • Videos
    • Books
Search
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Reading: IEC labelling for Resistors Color Code
Share
Notification Show More
Font ResizerAa
Inst ToolsInst Tools
Font ResizerAa
  • Courses
  • PLC Tutorials
  • Control Systems
Search
  • Ask
  • Courses
  • Videos
  • Q & A
    • Interview
    • MCQ
  • EE
    • Electronics
    • Electrical
  • Measure
    • Control Valves
    • Calibration
    • Temperature
    • Pressure
    • Flow
    • Level
    • Analyzers
    • Switches
    • Vibration
    • Solenoid Valve
  • Control
    • PLC Tutorials
    • Control Systems
    • Safety Instrumented System (SIS)
    • Communication
    • Fire & Gas System
  • More
    • Design
    • Tools
    • Animation
    • Basics
    • Formulas
    • Standards
    • TextBooks
    • Common
    • Software
    • Excel Tools
    • Erection & Commissioning
    • Process Fundamentals
    • Videos
    • Books
Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Inst Tools > Blog > Electronic Basics > IEC labelling for Resistors Color Code

IEC labelling for Resistors Color Code

Last updated: June 6, 2017 4:28 pm
Editorial Staff
Electronic Basics
No Comments
Share
4 Min Read
SHARE

The IEC also defines how manufacturers should mark the values of resistors and capacitors in the standard called IEC 60062. The colours used on fixed leaded resistors are shown below:

Colour code marking of leaded resistors

colour-code-marking-of-leaded-resistors

The  resistance  colour  code  consists  of  three  or  four  colour  bands  and  is followed by a band representing the tolerance. The temperature coefficient band, if provided, is to the right of the tolerance band and is usually a wide band positioned on the end cap.

The resistance colour code includes the first two or three significant figures of the resistance value (in ohms), followed by a multiplier. This is a factor by which the significant-figure value must be multiplied to find the actual resistance value. (i.e. the number of zeros to be added after the significant figures).

Whether two or three significant figures are represented depends on the tolerance: ±5% and wider require two band; ±2% and tighter requires three bands. The significant figures refer to the first two or three digits of the resistance value of the standard series of values in a decade, in accordance with IEC 60063 as indicated in the relevant data sheets and shown in Below Table.

The colours used and their basic numerical meanings are recognized internationally for any colour coding used in electronics, not just resistors, but some capacitors, diodes, cabling and other items.

how-to-find-resistor-value

The colours are easy to remember: Black is the absence of any colour, and therefore represents the absence of any quantity, 0. White (light) is made up of all colours, and so represents the largest number, 9. In between, we have the colours of the rainbow: red, orange, yellow, green, blue and violet. These take up the numbers from 2 to 7. A colour in between black and red would be brown, which has the number 1. A colour intermediate to violet and white is grey, which represents the number 8.

resistor-color-coding-example

When resistors are labelled in diagrams, such as schematics, IEC 60062 calls for  the  significant  figures  to  be  printed  as  such,  but  the  decimal  point  is replaced with the SI prefix of the multiplier. Examples of such labelling are shown below:

IEC labelling for Resistors

iec-labelling-for-resistors

Note how the decimal point is expressed, that the ohm symbol is shown as an R, and that 1000 is shown as a capital K. The use of a letter instead of a decimal point solves a printing problem – the decimal point in a number may not always be printed clearly, and the alternative display method is intended to help misinterpretation of component values in circuit diagrams and parts lists.

In circuit diagrams and constructional charts, a resistor’s numerical identity, or designator, is usually prefixed by ‘R’. For example, R15 simply means resistor number 15.

A portion of a schematic diagram showing designators and IEC labelling is shown below:

schematic-showing-resistor-iec-labelling

Note that resistor R4 has the value 4.7 Ω and resistor R12 has the value 330 Ω.

Don't Miss Our Updates
Be the first to get exclusive content straight to your email.
We promise not to spam you. You can unsubscribe at any time.
Invalid email address
You've successfully subscribed !
Zener Diode Voltage Regulators
Electrical Static Grounding Techniques
What is PCB Corrosion? Electronic Boards Corrosion Prevention
NO vs NC Contact
Difference Between LED and LCD
Share This Article
Facebook Whatsapp Whatsapp LinkedIn Copy Link
Share
Leave a Comment

Leave a Reply Cancel reply

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

Stay Connected

128.3kFollowersLike
69.1kFollowersFollow
208kSubscribersSubscribe
38kFollowersFollow

Categories

Recent Comments

  • Guifty Shimica on Top Non-PLC Certification Courses for Automation Professionals
  • Guifty Shimica on Top Non-PLC Certification Courses for Automation Professionals
  • MIHARITSOA Aina Sitraka on Top Non-PLC Certification Courses for Automation Professionals
  • Vaishnavi on Free Instrumentation Course for Trainee Engineers

Related Articles

Difference between Analog Signal and Digital Signal

What are Analog and Digital Signals? Differences, Examples

100 Electronics and Electrical Projects for Engineering Students

100 Electronics and Electrical Projects for Engineering Students

Testing a defective transistor

Testing a Transistor with a Digital Multimeter

How to Test a Transistor using Multimeter

How to Test a Transistor using Multimeter

How to Use SMD Components in Electronic Circuits

How to Use SMD Components in Electronic Circuits?

How are Silicon Chips Disposed?

How are Silicon Chips Disposed?

Top 100 555 Timer Projects for Engineering Students

Top 555 Timer Projects for Engineering Students

Diode-testing-with-multimeter

How to Test a Diode using Multimeter

More Articles

Measure AC Voltage using Multimeter

How to Measure AC Voltage using Multimeter

Synchronous Motor Starting Methods

Vortex Flow Meters

All About Vortex Flow Meters

optical fiber cable junction box

Underwater Fibre Optic Cable

How to Identify Phase, Earth, and Neutral Wires_

How to Identify Phase, Earth, and Neutral Wires?

Overview of Tank Gauging Technologies

Thermocouple Law of Intermediate Metals

Thermocouples Law of Intermediate Metals

Solenoid Valve Functional Testing

Solenoid Valve Functional Testing

Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Welcome Back!

Sign in to your account

Username or Email Address
Password

Lost your password?