磁鐵是通電(dian)(dian)(dian)(dian)產(chan)生電(dian)(dian)(dian)(dian)磁(ci)的(de)(de)一(yi)種裝置(zhi)。電(dian)(dian)(dian)(dian)磁(ci)鐵(tie)(tie)原理是在鐵(tie)(tie)芯的(de)(de)外部(bu)纏繞與其(qi)(qi)功率(lv)相匹配的(de)(de)導(dao)電(dian)(dian)(dian)(dian)繞組，這(zhe)種通有(you)電(dian)(dian)(dian)(dian)流的(de)(de)線圈像(xiang)磁(ci)鐵(tie)(tie)一(yi)樣具有(you)磁(ci)性(xing)，它(ta)也(ye)叫做電(dian)(dian)(dian)(dian)磁(ci)鐵(tie)(tie)。我(wo)(wo)們(men)通常把(ba)它(ta)制成條(tiao)形(xing)或蹄形(xing)狀(zhuang)，以使鐵(tie)(tie)芯更(geng)加容易磁(ci)化。另外，為了(le)使電(dian)(dian)(dian)(dian)磁(ci)鐵(tie)(tie)斷(duan)電(dian)(dian)(dian)(dian)立即消(xiao)(xiao)磁(ci)，我(wo)(wo)們(men)往(wang)往(wang)采用(yong)消(xiao)(xiao)磁(ci)較快的(de)(de)的(de)(de)軟鐵(tie)(tie)或硅鋼材(cai)料來(lai)制做。這(zhe)樣的(de)(de)電(dian)(dian)(dian)(dian)磁(ci)鐵(tie)(tie)在通電(dian)(dian)(dian)(dian)時有(you)磁(ci)性(xing)，斷(duan)電(dian)(dian)(dian)(dian)后磁(ci)就(jiu)隨之消(xiao)(xiao)失。電(dian)(dian)(dian)(dian)磁(ci)鐵(tie)(tie)在我(wo)(wo)們(men)的(de)(de)日常生活中有(you)著極其(qi)(qi)廣泛(fan)的(de)(de)應用(yong)，由(you)于它(ta)的(de)(de)發明也(ye)使發電(dian)(dian)(dian)(dian)機的(de)(de)功率(lv)得到了(le)很大的(de)(de)提(ti)高。