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Analyzing circuit with Silicon and Zener diode

  1. Jun 19, 2014 #1
    1. The problem statement, all variables and given/known data

    Determine Vout, the current flowing through R and power power dissipated the Zener diode.


    2. Relevant equations

    Circuit analyzing techniques.

    3. The attempt at a solution

    I've done this problem by assuming each diode is off while ignoring the other.

    E.g. Applying KVL: -24+VD=0 --> VD=24 (Silicon diode is on and will be replaced with 0.7V voltage source).
    Applying KVL again: -24-VDZ --> VDZ=-24 (Zener diode is reverse biased and will be replaced with VZT, which 12V voltage source).

    Is this approach correct?
  2. jcsd
  3. Jun 19, 2014 #2


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    Staff: Mentor

    Can you explain why someone might construct this crcuit?
  4. Jun 19, 2014 #3


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    Science Advisor
    Homework Helper

    That was a good hint from NascentOxygen.

    Make sure you understand what Zener diodes are commonly used for.
  5. Jun 19, 2014 #4

    rude man

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    Not a good idea. Why do you assume the diodes are off? They're not.
  6. Jun 19, 2014 #5


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    Staff: Mentor

    Poster is closely following a generalized technique he has been taught. Assume one "state" and prove or disprove it is true. With experience, will be able to short-circuit his procedures.
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