What does a shorted diode read when tested?

In a diode, when it is shorted, it allows current to flow in both directions, which signifies a failure of the diode's ability to control the flow of current as intended. Under normal conditions, a diode permits current to flow in one direction (forward bias) and blocks current in the reverse direction (reverse bias).

When testing a shorted diode with a multimeter in the continuity setting, you will observe output indicating continuity in both directions. This is due to the fact that the diode no longer displays its characteristic semiconducting behavior; it behaves like a wire connecting the anode and cathode directly.

Normal functioning diodes should show continuity forward but not in reverse. However, in this faulty case where the diode is shorted, it crosses those expected parameters, resulting in a reading of continuity regardless of the direction of current flow. Understanding this behavior is crucial for diagnosing issues within an electrical circuit or system where diodes play a critical role.