Zener Diode On: Understanding Current Flow in a Circuit

  • Thread starter Thread starter Pushoam
  • Start date Start date
  • Tags Tags
    Diode
Click For Summary

Homework Help Overview

The discussion revolves around understanding the behavior of a zener diode in a circuit, particularly focusing on current flow and the conditions under which the diode is considered to be "on." Participants are examining the relationships between different currents in the circuit and the implications for the zener diode's operation.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to analyze the current values through different resistors to determine if the zener diode is conducting. They present specific current values and compare them to assess the diode's state. Other participants confirm the analysis and provide additional voltage considerations.

Discussion Status

The discussion has seen some validation of the original poster's analysis, with participants confirming the correctness of the current comparisons. Additional insights regarding voltage without the zener diode have been introduced, suggesting a productive exploration of the topic.

Contextual Notes

There are implicit assumptions about the circuit configuration and the values of the components involved, which are not fully detailed in the posts. The discussion does not resolve these assumptions but acknowledges their presence in the analysis.

Pushoam
Messages
961
Reaction score
53

Homework Statement


upload_2017-9-15_14-51-40.png


Homework Equations

The Attempt at a Solution


I assume that the zener diode is on.
For this the current flowing through 1k##\Omega ~~i.e. ~~I_1## should be grater than the 3k##\Omega## i.e.##I_3##.
##I_3= 10/3~ mA
\\I_1 = 4 ~mA##
Clearly,##I_1 > I_3##. So, there is some current going through the zener diode. Hence, the zener diode is on.
Is this correct?
 

Attachments

  • upload_2017-9-15_13-27-25.png
    upload_2017-9-15_13-27-25.png
    3.9 KB · Views: 550
  • upload_2017-9-15_13-31-4.png
    upload_2017-9-15_13-31-4.png
    7.5 KB · Views: 555
Physics news on Phys.org
Your analysis is correct.
 
Thank you.
 
You could also see that without the zener the voltage would be 14/(3/4) = 10.5V which is > 10V.
 
  • Like
Likes   Reactions: Pushoam
Thank you.
 

Similar threads

  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 13 ·
Replies
13
Views
1K
Replies
3
Views
1K
  • · Replies 2 ·
Replies
2
Views
1K
Replies
2
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 17 ·
Replies
17
Views
3K
  • · Replies 8 ·
Replies
8
Views
2K
  • · Replies 3 ·
Replies
3
Views
1K
  • · Replies 1 ·
Replies
1
Views
2K