What happens when a diode is shorted?

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Solution

Diagram for shorted diode

Explanation for shorted diode
The voltage drop reading in the both directions will be the same, when a diode is shorted.
The reason for diode failure are excessive forward current and large reverse voltage.
A diode fails caused by over heating or overvoltage spike causes short circuit in diode.
A very large subthreshold swing implies that the device cannot be turned off. this process called as punch through.

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