LED shortage

Discussion in 'Homework Help' started by ShayanK1996, Feb 2, 2016.

  1. ShayanK1996

    Thread Starter New Member

    Feb 2, 2016
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    0
    Hi Guys!

    I was hoping if any of you guys could explain to me on how you would know which LED goes bad when the voltage drops. (part c in the attachement)
     
  2. dl324

    Distinguished Member

    Mar 30, 2015
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    Welcome to AAC!

    For homework, students are expected to show their work and Users will guide them to a solution.

    Also post the values from the parameter file.
     
    JohnInTX likes this.
  3. ShayanK1996

    Thread Starter New Member

    Feb 2, 2016
    2
    0
    VT = 0.25 V

    Ig = 5 mA

    Is1 = 30.72106 nA

    Is2 = 10.30577 pA

    Is3 = 562.6759 pA

    Vgc = 7 V

    I just need to understand the concept on how voltage is affects LED shortage.
     
  4. dl324

    Distinguished Member

    Mar 30, 2015
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    Use the formula for calculating the forward voltage of each diode. Then add them together and see how that compares to Vgc.

    What would the voltage across a shorted LED be?
     
  5. Wendy

    Moderator

    Mar 24, 2008
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  6. hp1729

    Well-Known Member

    Nov 23, 2015
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    Build it. I doesn't have to be LEDs. Resistors in series, same thing.
     
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