磁鐵是通電(dian)(dian)(dian)產生電(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)的(de)(de)一種裝(zhuang)置。電(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)鐵(tie)(tie)(tie)原理是在鐵(tie)(tie)(tie)芯(xin)的(de)(de)外部纏繞(rao)與(yu)其功率相匹配的(de)(de)導(dao)電(dian)(dian)(dian)繞(rao)組，這種通有電(dian)(dian)(dian)流的(de)(de)線圈像(xiang)磁(ci)(ci)(ci)(ci)(ci)鐵(tie)(tie)(tie)一樣具有磁(ci)(ci)(ci)(ci)(ci)性(xing)，它也叫(jiao)做電(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)鐵(tie)(tie)(tie)。我(wo)(wo)們(men)通常把它制(zhi)(zhi)成條形或蹄形狀(zhuang)，以使鐵(tie)(tie)(tie)芯(xin)更加容易磁(ci)(ci)(ci)(ci)(ci)化(hua)。另外，為了使電(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)鐵(tie)(tie)(tie)斷(duan)電(dian)(dian)(dian)立即消磁(ci)(ci)(ci)(ci)(ci)，我(wo)(wo)們(men)往往采用(yong)消磁(ci)(ci)(ci)(ci)(ci)較快的(de)(de)的(de)(de)軟(ruan)鐵(tie)(tie)(tie)或硅(gui)鋼材(cai)料來制(zhi)(zhi)做。這樣的(de)(de)電(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)鐵(tie)(tie)(tie)在通電(dian)(dian)(dian)時有磁(ci)(ci)(ci)(ci)(ci)性(xing)，斷(duan)電(dian)(dian)(dian)后(hou)磁(ci)(ci)(ci)(ci)(ci)就隨之消失。電(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)鐵(tie)(tie)(tie)在我(wo)(wo)們(men)的(de)(de)日常生活中有著極其廣泛的(de)(de)應用(yong)，由于(yu)它的(de)(de)發(fa)明(ming)也使發(fa)電(dian)(dian)(dian)機的(de)(de)功率得到了很大的(de)(de)提高(gao)。