1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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.

    123.png

    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

    NascentOxygen

    User Avatar

    Staff: Mentor

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

    CWatters

    User Avatar
    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

    User Avatar
    Homework Helper
    Gold Member



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

    NascentOxygen

    User Avatar

    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.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted