When testing a diode with an ohmmeter, which observation would be considered correct according to standard interpretation?

When testing a diode with an ohmmeter, which observation would be considered correct according to standard interpretation?

• A. Continuity in both directions
• B. No continuity in forward direction
• C. Continuity in both directions
• D. Open circuit in reverse direction

Answer: (C)

A diode conducts current in only one direction. When you test it with an ohmmeter, you apply a small voltage and the diode will show a low resistance (continuity) when the anode is connected to the meter’s positive lead, but if you reverse the leads the diode is reverse-biased and should block current, giving a high resistance or open circuit. So the standard reading is continuity in the forward direction and no continuity (open circuit) in the reverse direction. Seeing continuity in both directions would indicate a shorted diode or a measurement error, while no continuity in the forward direction means the diode isn’t conducting as it should.

A diode conducts current in only one direction. When you test it with an ohmmeter, you apply a small voltage and the diode will show a low resistance (continuity) when the anode is connected to the meter’s positive lead, but if you reverse the leads the diode is reverse-biased and should block current, giving a high resistance or open circuit. So the standard reading is continuity in the forward direction and no continuity (open circuit) in the reverse direction. Seeing continuity in both directions would indicate a shorted diode or a measurement error, while no continuity in the forward direction means the diode isn’t conducting as it should.