電子(zi)工程(cheng)師都學過(guo)電阻的基本作用，即(ji)在(zai)電(dian)(dian)路中(zhong)用(yong)作分(fen)壓器、分(fen)流(liu)器和負載(zai)電(dian)(dian)阻(zu)，它(ta)與電(dian)(dian)容器一起可以組成濾(lv)波(bo)器及延時電(dian)(dian)路、在電(dian)(dian)源電(dian)(dian)路或(huo)控制(zhi)電(dian)(dian)路中(zhong)用(yong)作取樣電(dian)(dian)阻(zu)；在半導體管(guan)電(dian)(dian)路中(zhong)用(yong)作偏置(zhi)電(dian)(dian)阻(zu)確定(ding)工(gong)作點；使用(yong)特殊(shu)性質的電(dian)(dian)阻(zu)如壓敏電(dian)(dian)阻(zu)、熱敏電(dian)(dian)阻(zu)實現(xian)防(fang)浪涌電(dian)(dian)壓、抑制(zhi)沖(chong)擊(ji)電(dian)(dian)流(liu)。實現(xian)過溫保護等。

電(dian)阻對于電(dian)源來說非常重要，那么具體都能起到哪些作用呢？

1.      跨接時用(yong)于電流(liu)回路(lu)

當分割電地(di)平面后，造(zao)成信號最短(duan)回流路徑(jing)斷裂(lie)，此時，信號回路不得不繞(rao)道，形(xing)成很大的環路面積，電場和(he)磁(ci)場的影響就變強了，容(rong)易干擾和(he)被干擾。在(zai)分割區(qu)上(shang)跨接(jie)O電阻，可以提供較短(duan)的回流路徑(jing)，減少干擾。

2.      配(pei)置(zhi)電路

一般，產品上不要出現跳線(xian)(xian)和撥碼開(kai)關。有(you)時(shi)(shi)用(yong)戶會(hui)亂動設置(zhi)，易引起誤會(hui)，為了減少維護費用(yong)，應(ying)用(yong)O歐電阻代(dai)替跳線(xian)(xian)等焊在板(ban)子上。空(kong)置(zhi)跳線(xian)(xian)在高(gao)頻(pin)時(shi)(shi)相當(dang)于天(tian)線(xian)(xian)，用(yong)貼片電阻更好。

另外電(dian)(dian)阻還可以在布線(xian)時(shi)跨調試；當作跳線(xian)用(yong)；還可以測部(bu)分(fen)電(dian)(dian)路的(de)耗電(dian)(dian)流時(shi)候使(shi)(shi)用(yong)，總之電(dian)(dian)阻在電(dian)(dian)源適配器電(dian)(dian)路中的(de)使(shi)(shi)用(yong)范圍時(shi)非常廣泛的(de)作為電(dian)(dian)子工程師，也(ye)要學會靈活使(shi)(shi)用(yong)