Can a Mistake in KVL Analysis Disprove a Fundamental Law?

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The discussion centers on a KVL (Kirchhoff's Voltage Law) analysis where the user encounters an inconsistency in voltage results between two loops, yielding +5V in one loop and -5V in another. The confusion arises from a misunderstanding of the circuit elements, particularly the diode and resistor, leading to an incorrect conclusion about disproving a fundamental law. Upon reevaluation, the user realizes they overlooked a 10V drop across the diode, which clarifies the discrepancy. This highlights the importance of accurately accounting for all circuit components in KVL analysis. Ultimately, the user resolves the issue by correcting their approach to the circuit.
sandy.bridge
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Here's my work. When I apply KVL around loop 1, I get +5V, but when I apply it around loop 2, I get -5, which is inconsistent with my first results?

Where am I going wrong, or have I disproved a fundamental law?

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Sorry, my work got cut out. The bottom says: +V+5=0, V=-5
 
I only see one loop. And what's the diode and resistor on the left supposed to be indicating?
 
I had redrawn the network on the left and configured it to the form on the right. This is how my textbook deals with KVL.
 
Never mind. I figured it out. I entirely forgot that there is a 10V drop across the diode.
 
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