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Help with a circuit question

Discussion in 'Electronics Homework Help' started by MrMoose, Jul 22, 2013.

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  1. MrMoose

    MrMoose

    1
    0
    Jul 22, 2013
    Can someone answer this question for me?

    In the circuit shown, the emitter voltage is zero. What is the problem?

    1. R1 is open.
    2. R2 is open.
    3. Capacitor C is shorted.
    4. R4 is open.

    Thanks for any help....studying this stuff has me to the point I am arguing with myself over the answers. :D

    Dave
     

    Attached Files:

  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    OK, consider:

    1) 0V with respect to what?

    2) What components are directly between the emitter and a source of that potential?
     
  3. hexreader

    hexreader

    126
    38
    Apr 21, 2011
    Since this is your homework, I think you should tell us what you think will happen in each case 1, 2, 3, 4.

    Then we can discuss any flaws in your arguments...

    Simply "answering the question" for you is not what homework help is about.

    Do we assume that nothing is connected to input and output?
     
    Last edited: Jul 22, 2013
  4. Y2KEDDIE

    Y2KEDDIE

    259
    15
    Sep 23, 2012
    Cicuit Diagram

    I'm curious; what does the inverted triangles represent? Is that your symbol for ground/common? Also is Vee positive or negative?

    I would make certain assumptions considering it's a PNP transistor. ;)
     
  5. davenn

    davenn Moderator

    13,833
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    Sep 5, 2009
    that's a pretty common symbol for GND :)

    Dave
     
  6. GENESIS_42

    GENESIS_42

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    0
    Jul 23, 2013
    You didn't mentioned the value of the resistors & the capacitor,and what kind of mesurement did you used?How can we know that those components are shorted or open?
     
  7. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    It's homework. It will essentially work for any positive, finite value.
     
  8. alfa88

    alfa88

    344
    5
    Dec 1, 2010
    Why not lay it out on a protoboard and end the argument with yourself?
     
  9. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,496
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    Jan 21, 2010
    MrMoose has probably already found someone willing to give him the answer already, but in case he hasn't, let's not do his homework for him eh?

    Perhaps (and this is a gentle hint) we can stop posting now unless he returns.
     
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