集(ji)電(dian)(dian)(dian)器(qi)從字面上(shang)理解(jie)，這就是收(shou)集(ji)器(qi)。在(zai)電(dian)(dian)(dian)子(zi)器(qi)件內，有時把用來收(shou)集(ji)電(dian)(dian)(dian)子(zi)的電(dian)(dian)(dian)極，例如受電(dian)(dian)(dian)子(zi)束所(suo)投射的電(dian)(dian)(dian)極叫(jiao)做集(ji)電(dian)(dian)(dian)器(qi)（即(ji)(ji)集(ji)電(dian)(dian)(dian)極）。在(zai)發電(dian)(dian)(dian)機(ji)內，則是將用來把電(dian)(dian)(dian)機(ji)內所(suo)產生的交變(bian)電(dian)(dian)(dian)流(liu)(liu)轉換(huan)為脈動電(dian)(dian)(dian)流(liu)(liu)，即(ji)(ji)變(bian)成方向(xiang)恒定(ding)而大小在(zai)變(bian)化著的電(dian)(dian)(dian)流(liu)(liu)的裝置(zhi)叫(jiao)做集(ji)電(dian)(dian)(dian)器(qi)。