Calculating Voltage with a diode

Discussion in 'Homework Help' started by wtfman, Oct 7, 2011.

  1. wtfman

    Thread Starter New Member

    Oct 7, 2011
    12
    0
    Hi im trying to find the voltage for VR1 and VR2 for this circuit but the fact that it is in parallel is throwing me off

    D1 is silicon with .7 V

    My try for the solution:

    VR1 = 10 volts
    And VR2= VR1 - .7V

    VR2 = 9.3 V

    Any help would be greatly appreciated
    Thanks
     
  2. jp1390

    Member

    Aug 22, 2011
    45
    2
    I think you may have forgotten to post the circuit. We can help you once we can see what you are talking about.

    JP
     
  3. wtfman

    Thread Starter New Member

    Oct 7, 2011
    12
    0
    lol sorry just posted it
     
  4. crutschow

    Expert

    Mar 14, 2008
    13,016
    3,235
    It's quite simple. Since the diode voltage drop is 0.7V and the diode is in parallel with R2 the what does the voltage across R2 have to be? (Big hint: All devices in parallel have the same voltage across them).

    The voltage across R1 is then 10V minus the voltage across R2.
     
  5. wtfman

    Thread Starter New Member

    Oct 7, 2011
    12
    0
    Voltage across R2 is .7 V
     
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