電(dian)感(gan)(gan)元件(jian)一般是(shi)由(you)導線(xian)(xian)(xian)(xian)(大多為帶(dai)絕緣層的(de)導線(xian)(xian)(xian)(xian))繞成空(kong)，心(xin)線(xian)(xian)(xian)(xian)圈或帶(dai)鐵心(xin)(磁(ci)(ci)心(xin))的(de)線(xian)(xian)(xian)(xian)圈而制成的(de)，所以(yi)又把電(dian)感(gan)(gan)元件(jian)稱為電(dian)感(gan)(gan)線(xian)(xian)(xian)(xian)圈，簡稱為線(xian)(xian)(xian)(xian)圈。任何(he)線(xian)(xian)(xian)(xian)圈有電(dian)流通(tong)過時，線(xian)(xian)(xian)(xian)圈的(de)周(zhou)圍(wei)就會產生磁(ci)(ci)場。當線(xian)(xian)(xian)(xian)圈中流過的(de)是(shi)直流電(dian)流時，其周(zhou)圍(wei)只呈現固定的(de)磁(ci)(ci)力線(xian)(xian)(xian)(xian)，不隨時間(jian)而變化(hua)。

當線圈(quan)中(zhong)通過交流(liu)電(dian)(dian)(dian)流(liu)時，其周圍(wei)則會出現隨時間而變(bian)化(hua)的(de)(de)磁(ci)力線。根據電(dian)(dian)(dian)磁(ci)定(ding)律可知，變(bian)化(hua)的(de)(de)磁(ci)力線在線圈(quan)兩(liang)端產(chan)生感應電(dian)(dian)(dian)動勢(shi)。這(zhe)種感應電(dian)(dian)(dian)動勢(shi)是(shi)由線圈(quan)中(zhong)電(dian)(dian)(dian)流(liu)引起的(de)(de)，即所謂的(de)(de)自(zi)感應作用(yong)，叫(jiao)做自(zi)感。

文章源自：電感，貼片電感、貼片電感代理商