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Homework Help: Current through diode

  1. Jun 30, 2010 #1
    1. The problem statement, all variables and given/known data

    find current through each diode, suppose that they are ideal (use the second approach)

    [PLAIN]http://img30.imageshack.us/img30/102/86772682.jpg [Broken]

    R is 10kohms
    3. The attempt at a solution

    a) (12-0.7)/10k = 1.13 mA

    b) 0 because diode will be open, actually i added up the two voltate sources and i have a voltage source of 16Volts where + is connected with diodes - and - is connected with diodes + so its reverse biased, hence current will be 0

    c) i added up the voltage sources i have 10 volts and its not reversed biased diodes voltage source will be 0.7


    (15-0.7)/10k = 1.43 mA

    d) added up voltage sources i had a source of 2 volts


    (2-0.7)/10000 = 0.13mA

    am i correct?
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Jun 30, 2010 #2
    Yeah a,b and d are correct, but in (c), the voltage across diode and resistor is 10 v and not 15 v as you have put in the equation.
  4. Jun 30, 2010 #3
    you are right, thanks a lot :))
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