Diode
Unidirectional current flow

The most common function of a diode is to allow an electric current to pass in one direction (called the diode's forward direction), while blocking it in the opposite direction (the reverse direction). Its hydraulic analogy is a check valve. This unidirectional behavior can convert alternating current (AC) to direct current (DC), a process called rectification. As rectifiers, diodes can be used for such tasks as extracting modulation from radio signals in radio receivers.
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