用電阻材料製成的、有一定結構形式、能(neng)在(zai)電(dian)路(lu)中(zhong)起(qi)限(xian)製(zhi)電(dian)流(liu)通(tong)過(guo)作(zuo)用(yong)的(de)二(er)端(duan)電(dian)子(zi)元(yuan)件(jian)。阻(zu)值(zhi)不(bu)能(neng)改(gai)變(bian)的(de)稱(cheng)為(wei)固(gu)定(ding)電(dian)阻(zu)器(qi)。阻(zu)值(zhi)可(ke)變(bian)的(de)稱(cheng)為(wei)電(dian)位(wei)器(qi)或(huo)可(ke)變(bian)電(dian)阻(zu)器(qi)。理(li)想(xiang)的(de)電(dian)阻(zu)器(qi)是(shi)線(xian)性(xing)的(de)，即(ji)通(tong)過(guo)電(dian)阻(zu)器(qi)的(de)瞬(shun)時(shi)電(dian)流(liu)與(yu)外(wai)加(jia)瞬(shun)時(shi)電(dian)壓(ya)成(cheng)正(zheng)比(bi)。一(yi)些(xie)特(te)殊(shu)電(dian)阻(zu)器(qi)
，如(ru)熱(re)敏(min)電(dian)阻(zu)器(qi)、yamindianzuqiheminganyuanjian
，qidianyayudianliudeguanxishifeixianxingde。dianzuqishidianzidianluzhongyingyongshuliangzuiduodeyuanjian，tongchangangonglvhezuzhixingchengbutongxilie
，gongdianlushejizhexuanyong。yixiashixiaobianweidajiadailaideshenmeshidianzuqi？dianzuqiyongtujidianzuqigongzuoyuanli。