Circuit Troubleshooting: Finding Correct States of Diodes

AI Thread Summary
In circuit troubleshooting involving diodes, the manual method of determining their states is primarily through guess and check, aligning with Kirchoff's laws. It is possible to find multiple combinations that satisfy these laws, indicating that the circuit may have more than one valid solution. The functioning of diodes is contingent on ensuring that reverse voltage does not exceed breakdown limits, as they only conduct in the forward direction. Utilizing the diode equation can provide further insights into their behavior. Understanding these principles is crucial for accurate circuit analysis and design.
seang
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Today in class we learned about diodes. Our prof explained to us that the only manual way to find the correct states of the diodes is guess and check. Each time, we ended with one correct circuit; that is Kirchoff's laws coincided with the diode constraints.

Now I'm doing this circuit on my own, and I'm finding that there are 2 combinations which fulfill Kirchoff's laws. Is this possible? or must I be making a mistake somewhere?

The circuit is simple really. DC sources resistors and diodes.
 
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As long as you don't put so large a reverse voltage across the diode to break it down, it will only conduct in the forward direction, when current flows from anode to cathode. It's best to think of diodes in terms of the diode equation:

http://en.wikipedia.org/wiki/Ideal_diode_equation
 
Take a look at the http://www.facstaff.bucknell.edu/mastascu/elessonshtml/Diodes/Diode1.html" and see if it helps answer your question.

Regards
 
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