More information about resistors would be helpful.

Discussion in 'Feedback and Suggestions' started by Windex, Feb 18, 2005.

  1. Windex

    Thread Starter Member

    Feb 2, 2005
    11
    0
    There are formulas that tell a person how long it takes until a resistor will burn out with applied power. Could someone help put that information into this website?
     
  2. Firestorm

    Senior Member

    Jan 24, 2005
    353
    0
    are u talking about on the forums or the book type section???
    if on the forum ill try to put something together...thx l8er

    -fire
     
  3. Rajan59

    New Member

    Feb 20, 2005
    1
    0
    Power capacity of resisitors

    Power capacity for the resistor is indicated in Watts.

    For example; Take a 100 ohm, 10watts resistor,

    there is a simple formulae for power in electricity,

    Power P = voltage x current,
    but voltage = current x resistance
    Hence Power is also = current x current xresistance
    The units for Power in watts,voltage in volts and current in amps.
    Here for the resistor 10 watts , the value of the resistor 100 ohm is the limiting factor for the current flowing in the resistor.(and also 10Volts is applied acrossthe resistor)
    The current flowing = voltage/resistance =10/100 = 0.1 amp only,but
    Maximum current allowable through the resistor is = power/voltage = 10/10=1.0amp
    If it exceeds 1.0 amp current the resistor starts burning.now safe.
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Hi,

    You may have a fun time coming up with a generallized formula. The time to fry a phenolic-over-carbon resistor is going to be different than for a wirewould unit of about the same dissipation. And I suspect that trimmed film on ceramic will be a bit different than the other two.

    I always thought the trick was to keep from burning up your resistors.
     
  5. n9xv

    Senior Member

    Jan 18, 2005
    329
    1
    Double the power rating of the previously "burntout" resistor. :lol:
     
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