resistor doubt!

Discussion in 'Wireless & RF Design' started by aj_silverthunder, Nov 13, 2009.

  1. aj_silverthunder

    Thread Starter Active Member

    Jun 6, 2009
    116
    0
    in many RF amplifier u can see resistor of value " 470ohm/2W" ,then what will be the color code for that resistor!please explain me guys! the resistor code for 470Ω is yellow violet brown,but how to identify the watts!
     
  2. BMorse

    Senior Member

    Sep 26, 2009
    2,675
    234

    Usually by size of resistor.......[​IMG]


    Go here to learn more about resistors and power ratings >>> http://www.ikalogic.com/beg_1_res_v_c.php
     
  3. aj_silverthunder

    Thread Starter Active Member

    Jun 6, 2009
    116
    0
    wont there be any colour code to identify the resistor watts.
     
  4. BMorse

    Senior Member

    Sep 26, 2009
    2,675
    234

    NO, the size tells you if it is 1/8,1/4,1/2,1 etc....
     
  5. ELECTRONERD

    Senior Member

    May 26, 2009
    1,146
    16
    Resistor color bands determine the actual resistance value in ohms. So since you want a 470Ω resistor, the color bands would be yellow, purple, and brown. The third band is the multiplier, so since brown=1 that means we have only one zero. If it was a yellow band then we'd implement four zero's. Then there is tolerance band which is usually gold (5%); this indicates the accuracy of the resistors value. So the resistor color bands only give you the resistance value in ohms.

    Austin
     
  6. aj_silverthunder

    Thread Starter Active Member

    Jun 6, 2009
    116
    0
    thanks a lot friends
     
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