Diode Polarity: Anode, Cathode, Forward Bias

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Discussion Overview

The discussion centers on the concept of diode polarity, specifically the conditions for forward bias operation. Participants explore the relationship between voltage potentials at the anode and cathode, and the implications of these conditions on diode functionality.

Discussion Character

  • Conceptual clarification
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions the meaning of diode polarity and suggests that connecting the anode to a positive voltage and the cathode to a negative voltage indicates forward bias operation.
  • Another participant asserts that a positive terminal at a higher potential than a negative terminal is necessary for the diode to operate in forward bias, providing an example with specific voltage values.
  • A later reply emphasizes that the diode only perceives the potential difference across its terminals, noting the importance of current limiting to prevent damage to the diode.
  • Concerns are raised about the potential for high current in low power diodes when subjected to certain voltage conditions, highlighting the exponential relationship between voltage and current in diodes.

Areas of Agreement / Disagreement

Participants express varying levels of understanding regarding diode polarity and forward bias, with some agreeing on the basic principles while others seek clarification. The discussion does not reach a consensus on all aspects of diode operation.

Contextual Notes

Participants reference external sources for additional information, indicating a reliance on existing literature to clarify their understanding. There are unresolved questions about specific details of diode operation and the implications of voltage levels.

Who May Find This Useful

This discussion may be of interest to individuals studying electronics, particularly those seeking to understand diode behavior in circuits.

Usama Khurram
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What is meant by diode polarity. If we do connect anode to positive and cathode to negative then its means it works on Forward Bias mode. I think positive means higher potential than negative, in other words, if positive terminal which is Anode is to be at 5 volts and negative terminal which is Cathode will have to at 2 volts then Diode will work in Forward bias region.? Please explain if I'm right understanding of this.
 
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Usama Khurram said:
buddy, i can search it through internet but i know i can't find whatever i needed. so please reply me

so is there something specific on any of those 2 links that you don't understand in how it may answer your original question ?
 
Usama Khurram said:
What is meant by diode polarity. If we do connect anode to positive and cathode to negative then its means it works on Forward Bias mode. I think positive means higher potential than negative, in other words, if positive terminal which is Anode is to be at 5 volts and negative terminal which is Cathode will have to at 2 volts then Diode will work in Forward bias region.? Please explain if I'm right understanding of this.
Hi Usame. You have it right. All the diode itself sees at its terminals is the potential difference there.

But with 3V across the diode and no current limiting, the diode current will be very high (remember, it's an exponential relationship). If it is a low power diode it will instantly burn out. A big power diode constructed like a bolt so it can be mounted on a heatsick, will be capable of withstanding 3V in forward conduction. It has some ohmic resistance and this will help limit the current.
Good luck with your studies! http://thumbnails111.imagebam.com/37333/4d0696373324852.jpg
 
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