集(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)從字面上理解，這就是收集(ji)器(qi)(qi)(qi)。在(zai)電(dian)(dian)(dian)(dian)(dian)子器(qi)(qi)(qi)件內(nei)(nei)，有(you)時把(ba)用來(lai)收集(ji)電(dian)(dian)(dian)(dian)(dian)子的(de)(de)電(dian)(dian)(dian)(dian)(dian)極，例如(ru)受電(dian)(dian)(dian)(dian)(dian)子束所投(tou)射的(de)(de)電(dian)(dian)(dian)(dian)(dian)極叫做(zuo)集(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)（即集(ji)電(dian)(dian)(dian)(dian)(dian)極）。在(zai)發電(dian)(dian)(dian)(dian)(dian)機內(nei)(nei)，則(ze)是將(jiang)用來(lai)把(ba)電(dian)(dian)(dian)(dian)(dian)機內(nei)(nei)所產生的(de)(de)交變(bian)電(dian)(dian)(dian)(dian)(dian)流(liu)轉換為脈動電(dian)(dian)(dian)(dian)(dian)流(liu)，即變(bian)成方向恒定而(er)大小在(zai)變(bian)化著的(de)(de)電(dian)(dian)(dian)(dian)(dian)流(liu)的(de)(de)裝置叫做(zuo)集(ji)電(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)。