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
    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
    are u talking about on the forums or the book type section???
    if on the forum ill try to put something together...thx l8er

  3. Rajan59

    New Member

    Feb 20, 2005
    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 safe.
  4. beenthere

    Retired Moderator

    Apr 20, 2004

    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
    Double the power rating of the previously "burntout" resistor. :lol: