Analyzing circuit with Silicon and Zener diode

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Discussion Overview

The discussion revolves around analyzing a circuit that includes silicon and Zener diodes, focusing on determining the output voltage (Vout), current through a resistor (R), and power dissipated by the Zener diode. The context includes homework-related problem-solving and circuit analysis techniques.

Discussion Character

  • Homework-related
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant describes their approach to the problem, which involves assuming each diode is off while analyzing the circuit using Kirchhoff's Voltage Law (KVL).
  • Another participant questions the validity of assuming the diodes are off, suggesting that this assumption may not be appropriate.
  • A third participant notes the importance of understanding the common applications of Zener diodes, implying that this knowledge may inform the analysis.
  • There is a mention of a generalized technique where one assumes a state and then proves or disproves its validity, indicating a methodical approach to circuit analysis.

Areas of Agreement / Disagreement

Participants express differing views on the initial assumption of the diodes being off. Some challenge this approach, indicating a lack of consensus on the correctness of the method used in the analysis.

Contextual Notes

The discussion highlights potential limitations in the assumptions made about the states of the diodes, as well as the dependence on the specific circuit configuration and the definitions of the components involved.

JasonHathaway
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Homework Statement



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

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Homework Equations



Circuit analyzing techniques.

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?
 
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Can you explain why someone might construct this crcuit?
 
That was a good hint from NascentOxygen.

Make sure you understand what Zener diodes are commonly used for.
 
JasonHathaway said:

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



Not a good idea. Why do you assume the diodes are off? They're not.
 
rude man said:
Not a good idea. Why do you assume the diodes are off? They're not.
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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