Explanation: Diodes conduct only when they are forward biased. Since, AC reverses it direction periodically, the diode conducts only in half cycles and insulates during the other cycles. This property of a diode is used in rectification of AC into DC.

Does a diode work with AC or DC?

Diodes are also known as rectifiers because they change alternating current (ac) into pulsating direct current (dc). ... When a diode allows current flow, it is forward-biased. When a diode is reverse-biased, it acts as an insulator and does not permit current to flow.

What does a diode do to AC current?

When the AC voltage is positive on the cathode side of the diode, the diode allows the current to pass through to the output. But when the AC current reverses direction and becomes negative on the cathode side of the diode, the diode blocks the current so that no voltage appears at the output.