主动元件(active component)又称有源元件,是一种具有增益,或是依靠电流方向的电子零件。实际上,是指电阻电容电感 (它们称为“被动元件”)以外的电子零件。主动元件的例子如晶体管可控硅整流器真空管等。

在电力工程学中,译为能动部件,是依靠触发、机械运动或动力源等外部输入,而行使功能的部件。

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