集(ji)(ji)(ji)電(dian)(dian)(dian)(dian)器(qi)從字面(mian)上理解，這就是收集(ji)(ji)(ji)器(qi)。在電(dian)(dian)(dian)(dian)子(zi)器(qi)件內，有時(shi)把用(yong)來收集(ji)(ji)(ji)電(dian)(dian)(dian)(dian)子(zi)的(de)(de)電(dian)(dian)(dian)(dian)極(ji)，例如受電(dian)(dian)(dian)(dian)子(zi)束所(suo)投射的(de)(de)電(dian)(dian)(dian)(dian)極(ji)叫做集(ji)(ji)(ji)電(dian)(dian)(dian)(dian)器(qi)（即(ji)集(ji)(ji)(ji)電(dian)(dian)(dian)(dian)極(ji)）。在發電(dian)(dian)(dian)(dian)機(ji)(ji)內，則是將(jiang)用(yong)來把電(dian)(dian)(dian)(dian)機(ji)(ji)內所(suo)產(chan)生的(de)(de)交變(bian)電(dian)(dian)(dian)(dian)流(liu)轉換為脈動電(dian)(dian)(dian)(dian)流(liu)，即(ji)變(bian)成方向恒定而大小在變(bian)化(hua)著的(de)(de)電(dian)(dian)(dian)(dian)流(liu)的(de)(de)裝置叫做集(ji)(ji)(ji)電(dian)(dian)(dian)(dian)器(qi)。