Discharge of a capacitor through a common ground

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Discussion Overview

The discussion revolves around the behavior of a capacitor discharging through a common ground in a circuit, particularly when there is a potential difference between the capacitor's positive plate and other components connected to the ground. The scope includes conceptual understanding and circuit design considerations.

Discussion Character

  • Exploratory, Conceptual clarification, Technical explanation

Main Points Raised

  • One participant inquires whether current will flow through other components connected to a common ground when a capacitor discharges from its positive plate, given a potential difference exists.
  • Another participant suggests that the capacitor's discharge behavior will be influenced by the reverse Zener clamping voltage of connected Zener diodes, and mentions that the discharge rate will depend on the reverse leakage current of those diodes.
  • A participant acknowledges a misunderstanding in their initial assumptions about the circuit's operation after receiving clarification.

Areas of Agreement / Disagreement

The discussion does not reach a consensus, as participants explore different aspects of the circuit behavior and clarify misunderstandings without resolving all uncertainties.

Contextual Notes

The discussion lacks a schematic representation of the circuit, which may limit the clarity of the points raised. Assumptions about the circuit's operation and the role of the Zener diodes remain unresolved.

shlver
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Let's say a switch causes a capacitor to charge and the switch opening causes the capacitor to discharge from its positive plate through a common ground to its negative plate. This common ground is connected to other components, if there is a difference in potential in other components to the positive plate tied to ground, will current flow? If so, will it cause heating issues? I've just started studying circuits a couple of months ago so I apologize if anything is unclear. Thank you!
 
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shlver said:
Let's say a switch causes a capacitor to charge and the switch opening causes the capacitor to discharge from its positive plate through a common ground to its negative plate. This common ground is connected to other components, if there is a difference in potential in other components to the positive plate tied to ground, will current flow? If so, will it cause heating issues? I've just started studying circuits a couple of months ago so I apologize if anything is unclear. Thank you!
Welcome to the PF. :smile:

Can you post a sketch of the circuit you are asking about? That would make it easier for us to respond. Thanks.
 
I don't really have a schematic. It was just a random thought I had when I saw a two zener diodes like the one linked(Sorry it's not a complete circuit lol). When a switch was put into place the capacitor charged, and when the switch was open the capacitor was tied to ground to discharge to the negative plate. I was just wondering if there was a difference in potential between the positive plate and other components tied to the ground would current flow in those branches as well.
http://imgur.com/a/Xr93U
 
shlver said:
I don't really have a schematic. It was just a random thought I had when I saw a two zener diodes like the one linked(Sorry it's not a complete circuit lol). When a switch was put into place the capacitor charged, and when the switch was open the capacitor was tied to ground to discharge to the negative plate. I was just wondering if there was a difference in potential between the positive plate and other components tied to the ground would current flow in those branches as well.
http://imgur.com/a/Xr93U
There's no switch shown in the circuit, but if you are asking what happens when the cap is charged up and the charging voltage source is removed...

The capacitor charging voltage will be limited by the reverse Zener clamping voltage of the two Zener diodes. Once the voltage source is removed, the capacitor will discharge at a rate determined by the reverse leakage current of the Zener diodes. Does that help?

You could use Google Images to look for other circuits that may express your question better...
 
Yes that was very helpful. The explanation cleared up that my earlier thought was based on a faulty assumption about the operation of that circuit. I'll try to design a circuit that better expresses my question.
 

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