Category:Electronic Components Component Learning

Group Administrators: 1 | Group Member: 353 | Group Threads: 358

Electronic components are basic electronic element or electronic parts usually packaged in a discrete form with two or more connecting leads or metallic pads. Electronic Components are intended to be connected together, usually by soldering to a printed circuit board (PCB), to create an electronic circuit with a particular function.

Thread Reply
Identify Resistors Reply 2017-01-28 17:11:45
261 views
1 comments
12 likes

Remco Stoutjesdijk

Leave A Message

Follow

How to Identify Resistors

Two Methods:Color Coded Resistors (Axial Resistors)Alphanumerically Coded Resistors (Surface Mounted Resistors)Community Q&A
Resistors are very common components in electronic circuits of all kinds. Their function is to resist the current flowing in the circuit, and how much resistance they provide is measured in ohms. Most are printed with either a color code or an alphanumeric code to indicate their ohmic value and tolerance -- how much their resistance may vary. Learning the codes, along with using a helpful mnemonic device, will allow you to identify resistors easily.

Steps

Method1
Color Coded Resistors (Axial Resistors)
1
Axial resistors are cylindrical with leads extending from each end.
  • 2
    Look at the resistor so the group of 3 or 4 color bands are on the left side. These are sometimes followed by a gap, then an additional color band.
  • 3
    Read the color bands from left to right. The colors on the first 2 or 3 bands correspond to numbers from 0 to 9, which represent the significant digits of the resistor's ohmic value. The last band gives the multiplier. For example, a resistor with brown, green and green bands is rated at 15 mega-ohms (15,000,000 ohms). The code is as follows:
    • Black: 0 significant digit, multiplier of 1
    • Brown: 1 significant digit, multiplier of 10
    • Red: 2 significant digit, multiplier of 100
    • Orange: 3 significant digit, multiplier of 1,000 (kilo)
    • Yellow: 4 significant digit, multiplier of 10,000 (10 kilo)
    • Green: 5 significant digit, multiplier of 100,000 (mega)
    • Blue: 6 significant digit, multiplier of 1,000,000 (10 mega)
    • Violet: 7 significant digit
    • Gray: 8 significant digit
    • White: 9 significant digit
    • Gold: multiplier of 1/10
    • Silver: multiplier of 1/100
  • 4
    Read the color on the last color band, which is farthest right. This represents the tolerance of the resistor. If there is no color band, the tolerance is 20 percent. Most resistors have no band, a silver band or a gold band, but you may find resistors with other colors. The tolerance color code is as follows:
  • 5
    Brown: 1 percent tolerance
  • 6
    Red: 2 percent tolerance
  • 7
    Orange: 3 percent tolerance
  • 8
    Green: 0.5 percent tolerance
  • 9
    Blue: 0.25 percent tolerance
  • 10
    Violet: 0.1 percent tolerance
  • 11
    Gray: 0.05 percent tolerance
  • 12
    Gold: 5 percent tolerance
  • 13
    Silver: 10 percent tolerance
  • 14
    Memorize a mnemonic for resistors. Several exist, so choose the one that you won't forget. Remember that the first color is black, and afterward each first letter corresponds to a color in order from 0 to 9. Some popular mnemonic devices include:
    • "Bad beer rots our young guts but vodka goes well."
    • "Bright boys rave over young girls but veto getting wed."
    Method2
    Alphanumerically Coded Resistors (Surface Mounted Resistors)
    1
    Surface mounted resistors are rectangular in shape with leads that extend from opposite sides or the same side and are bent downward for mounting on circuit boards. Some resistors have contact plates on the bottom.
  • 2
    Read the 3 or 4 numbers on the resistor. The first 2 or 3 represent the significant digits and the last indicates the number of 0s that should follow. For example, a resistor reading 1252 indicates a rating of 12,500 ohms or 1.25 kilo-ohms.
  • 3
    Compare the letter at the end of the code with the tolerance it represents.
  • 4
    A: 0.05 percent tolerance
  • 5
    B: 0.1 percent tolerance
  • 6
    C: 0.25 percent tolerance
  • 7
    D: 0.5 percent tolerance
  • 8
    F: 1 percent tolerance
  • 9
    G: 2 percent tolerance
  • 10
    J: 5 percent tolerance
  • 11
    K: 10 percent tolerance
  • 12
    M: 20 percent tolerance
  • 13
    Check to see if there is a letter "R" within the numeric code. This indicates a very small resistor, and the letter takes the place of a decimal point. For instance, a 5R5 resistor is rated at 5.5 ohms.
    Community Q&A
    Search
    Add New Question
    Unanswered Questions
    • How do you test capacitors?
      Answer this question Flag as... Flag as...
    • How to calculate resisters' values?
      Answer this question Flag as... Flag as...
    • Seem to have trouble with identifying a surface mounted resistor after reading this guide. The code on it is 25W1R0JN. Does anyone happen to know what it is? It's off of a speaker crossover.
      Answer this question Flag as... Flag as...
    Show more unanswered questions
    Ask a Question
    200 characters left
    Submit
    • Already answered
    • Not a question
    • Bad question
    • Other
    If this question (or a similar one) is answered twice in this section, please click here to let us know.

    EditRelated wikiHows

    How to
    Remember Electrical Resistor Color Codes
    How to
    Test Resistors
    How to
    Read Axial Lead Resistors
    How to
    Solve a Series Circuit
    How to
    Discharge a Capacitor
    How to
    Test a Transistor
    How to
    Make a Parallel Circuit
    How to
    Solder Electronics
    How to
    Read Schematics
    How to
    Build a Capacitor

    Sources and Citations

    • http://en.wikibooks.org/wiki/Electronics/Component_Identification

    Made Recently

  • 12 likes
    Statement: This post is only the personal view of the author and does not represent the opinions of ALLPCB.com.

    Bishop

    Leave A Message

    Follow

    Wow, these helpful info benefit me a lot. Great thanks to you.
    ThreadReply