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    Resistor Colour Code

    Uploaded by

    Solomon Thomas
    The document discusses resistor color coding, which uses colored bands to identify a resistor's value and tolerance. It explains that resistors come in a range of resistance values from fractions of an ohm to millions of ohms. Carbon resistors are too small to mark directly, so color bands are used instead. The document provides instructions for reading the color bands from left to right and calculating the resistor value based on the digit, multiplier, and number of zeros represented by each band. Examples are given to demonstrate calculating the range of resistance values based on the bands and tolerance.

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    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd

    Resistor Colour Code

    Uploaded by

    Solomon Thomas
    40 views14 pages
    The document discusses resistor color coding, which uses colored bands to identify a resistor's value and tolerance. It explains that resistors come in a range of resistance values from fractions of an ohm to millions of ohms. Carbon resistors are too small to mark directly, so color bands are used instead. The document provides instructions for reading the color bands from left to right and calculating the resistor value based on the digit, multiplier, and number of zeros represented by each band. Examples are given to demonstrate calculating the range of resistance values based on the bands and tolerance.

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    Original Title

    RESISTOR COLOUR CODE

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    © © All Rights Reserved

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    The document discusses resistor color coding, which uses colored bands to identify a resistor's value and tolerance. It explains that resistors come in a range of resistance values from fractions of an ohm to millions of ohms. Carbon resistors are too small to mark directly, so color bands are used instead. The document provides instructions for reading the color bands from left to right and calculating the resistor value based on the digit, multiplier, and number of zeros represented by each band. Examples are given to demonstrate calculating the range of resistance values based on the bands and tolerance.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    40 views14 pages

    Resistor Colour Code

    Uploaded by

    Solomon Thomas
    The document discusses resistor color coding, which uses colored bands to identify a resistor's value and tolerance. It explains that resistors come in a range of resistance values from fractions of an ohm to millions of ohms. Carbon resistors are too small to mark directly, so color bands are used instead. The document provides instructions for reading the color bands from left to right and calculating the resistor value based on the digit, multiplier, and number of zeros represented by each band. Examples are given to demonstrate calculating the range of resistance values based on the bands and tolerance.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    of 14

    ELECTRICAL AND

    ELECTRONIC
    TECHNOLOGY
    FORM 5th
    MR. JACKSON
    RESISTOR COLOUR CODE (CARBON RESISTOR)
    Learning Objectives

    At the ended of the lesson I should be able to:

     Identify two (2) purpose for resistor coding.


     Read resistor from correct direction.
     Sketch and label at least a 3 band resistor.
     Use at least one (1) expressions to remember resistor color code.
     Calculate the range of resistance.
    Resistor Colour Code

    Resistor Colour Coding uses


    coloured bands to easily identify
    a resistors resistive value and its
    percentage tolerance.
    Resistor Colour Code (continue)

    There are many different types of


    Resistor available which can be used in
    both electrical and electronic circuits to
    control the flow of current or to
    produce a voltage drop in many
    different ways.
    Resistor Colour Code (continue)

    However, in order to do this the actual resistor


    needs to have some form of “resistive” or
    “resistance” value.

    Resistors are available in a range of different


    resistance values from fractions of an Ohm ( Ω )
    to millions of Ohms.
    Resistor Colour Code (continue)

    Carbon resistors are very small and


    thus it is very hard to mark them with a
    rating such as 120,000. In such cases
    of carbon resistors, it is usually easier
    to identify their ratings by means of
    rings or bands painted around them.
    How to read resistor for their value

    The resistor colour code markings are


    always read one band at a time starting from
    the left to the right, with the larger width
    tolerance band oriented to the right side
    indicating its tolerance.
    Resistor Band

    These resistors are normally of 3 – bands, 4 –


    bands and 5 – bands. The last band, which is not
    the tolerance, indicates the number of zero(s) to be
    added while the bands before the last band each
    represents a significant number.
    RESISTOR BANDS
    The Resistor Colour Code Table
    Colour Digit Multiplier Tolerance
    Black 0 1  
    Brown 1 10 ± 1%
    Red 2 100 ± 2%
    Orange 3 1,000  
    Yellow 4 10,000  
    Green 5 100,000 ± 0.5%
    Blue 6 1,000,000 ± 0.25%

    Violet 7 10,000,000 ± 0.1%

    Grey 8 ± 0.05%
    White 9  
    Gold 0.1 ± 5%
    Silver 0.01 ± 10%
    None ± 20%
     Bad Boys Ring Our Young Girls But Vicky Goes Without
     Better Be Right Or Your Great Big Venture Goes Wrong
     Buster Brown Races Our Young Girls But Vicky Generally Wins (This one
    indicates the position of Brown
     Bad Booze Rots Our Young Guts But Vodka Goes Well (in) Silver Goblets (This
    one includes the tolerance bands of Gold, Silver)
    Calculating Resistor Values

     The Resistor Colour Code system is all well and good but we need to
    understand how to apply it in order to get the correct value of the resistor.
    The “left-hand” or the most significant coloured band is the band which is
    nearest to a connecting lead with the colour coded bands being read from
    left-to-right as follows:
     Digit, Digit, Multiplier = Colour, Colour x 10 colour  in Ohm’s (Ω)
     For example, a resistor has the following coloured markings;
     Yellow Violet Red = 4 7 2 = 4 7 x 102 = 4700Ω or 4k7 Ohm.
    Calculating Resistor Values (continue)

    Example 1: A 3- band resistor with colours


    brown, red, yellow and silver. Calculate its range of
    resistance.

    Brown Red Yellow Silver


    1st sig. # 2nd sig. # # of zeros tolerance
    1 2 0000  10
    Nominal Value.  120, 000

    10
    The tolerance is  x Nominal Value
    100

     0.1 x 120,000

     12,000

    1st case  120,000  12,000  108,000

    2 nd case  120,000  12,000  132,000

    The range of resistance is from 108000 to


    132000
    Calculating Resistor Values (continue)

    Example 2: A 4-band resistor with the colours


    blue, yellow, green and orange, calculate its
    range of resistance.
    Blue Yellow Green Orange
    1st sig. # 2nd sig. # 3nd sig. # # of zeros
    6 4 5 000

    Nominal value  645000  20% (since no colour


    was given)

    20
    The tolerance is  x Nominal Value
    100

     0.2 x 645,000

     129 ,000

    1st case  645,000  129,000  516,000

    2 nd case  645,000  129,000  774,000

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