Power Supply Output: Connecting + and - to Plates

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Discussion Overview

The discussion revolves around the proper connections for a power supply when creating a capacitor with two parallel plates. Participants explore the roles of positive, negative, and ground connections, as well as the function of a terminal labeled "COM" on the power supply.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant suggests connecting the positive terminal to one plate and the negative terminal to the other, stating that the ground is unnecessary.
  • Another participant echoes the connection advice but does not provide additional context or reasoning.
  • A participant expresses confusion about the operation of the power supply, particularly regarding the ground connection and the meaning of "COM."
  • One response advises ignoring the ground connection and suggests checking the resistance between the COM terminal and ground, proposing that they may be connected.
  • The same response speculates that the COM terminal is likely a common terminal, recommending the use of a digital multimeter (DMM) for further investigation.

Areas of Agreement / Disagreement

There is no clear consensus on the necessity of the ground connection, with some participants asserting it is not needed while others express confusion about its role. The understanding of the COM terminal also remains unclear among participants.

Contextual Notes

Participants have not fully resolved the implications of the ground connection or the function of the COM terminal, and there are varying levels of understanding regarding the power supply's operation.

anameel
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I am trying to make a capacitor by connecting + and - to the electrodes between two parallel plates. There are + and - and Ground in the power supply which of these should I connect to the two plates and how does it work.


thanks
 
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Connect positive to one side and negative to the other. No ground. Check out

http://ocw.mit.edu/courses/physics/8-02-electricity-and-magnetism-spring-2002/video-lectures/lecture-7-capacitance-and-field-energy/
 
LostConjugate said:
Connect positive to one side and negative to the other. No ground. Check out

http://ocw.mit.edu/courses/physics/8-02-electricity-and-magnetism-spring-2002/video-lectures/lecture-7-capacitance-and-field-energy/


thanks
 
I am having a problem to understand how this power supply works. (attached)
photo.jpg



could anyone please explain to me how it works. I am confused with the ground part. Also, I do not know what COM is?
 
Ignore it.

You simply do not need it.

If you have a DMM check resistance from that terminal to the ground prong on the power plug. They may be connected.

I would guess that the Com terminal is just that, common. Again use your DMM to check resistance between the 2 com terminals.
 

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