A device utilized to permit current flow in one direction in a circuit, and to inhibit current flow in the other direction. In computers, these diodes are primarily germanium or silicon crystals.

• 电路中允许电流在一个方向流过而禁止在另一个方向流过的电子器件。在计算机中，这些二极管基本上是锗或硅晶体二极管。