Which unit is used for testing diodes?

Testing diodes primarily involves measuring their resistance, which is typically done using an ohmmeter. When a diode is tested in the forward direction (forward bias), it should show a low resistance, indicating that it allows current to flow easily. In the reverse direction (reverse bias), it should exhibit a high resistance or infinite resistance, indicating that it blocks current flow effectively. This characteristic of diodes is fundamental to their operation as semiconductor devices.

While voltage, current, and power are essential concepts in understanding diodes' behavior and applications, they are not the primary measurements used to test a diode's functionality. Voltage is more about the potential difference across the diode, current pertains to the flow through the diode, and power relates to the energy consumed or produced. Resistance testing directly reveals whether a diode is functioning correctly by checking its ability to allow or block current, making it the most relevant method for assessing diode health.