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所(suo)有(you)電(dian)(dian)池(chi)的內阻都是越小好,內阻越小,大電(dian)(dian)流放(fang)電(dian)(dian)能力越強,電(dian)(dian)能釋放(fang)越充分。
任(ren)何電源都(dou)或(huo)多或(huo)少的(de)具有一定(ding)的(de)內阻,為了提高(gao)帶(dai)負(fu)載能力,我們希望電源的(de)內阻越(yue)(yue)小越(yue)(yue)好。
上圖中電(dian)(dian)(dian)阻(zu)(zu)r為(wei)汽車(che)電(dian)(dian)(dian)瓶的(de)(de)內(nei)阻(zu)(zu),RL為(wei)負(fu)載(zai)(zai),其與(yu)電(dian)(dian)(dian)瓶內(nei)阻(zu)(zu)r為(wei)串聯關系,流過r的(de)(de)電(dian)(dian)(dian)流與(yu)負(fu)載(zai)(zai)電(dian)(dian)(dian)流相等(deng)。假設(she)r的(de)(de)大(da)小(xiao)(xiao)不(bu)變,則負(fu)載(zai)(zai)電(dian)(dian)(dian)流越大(da),流過內(nei)阻(zu)(zu)r的(de)(de)電(dian)(dian)(dian)流也越大(da),r兩端的(de)(de)電(dian)(dian)(dian)壓(ya)也就越高,從而(er)使加在負(fu)載(zai)(zai)RL兩端的(de)(de)電(dian)(dian)(dian)壓(ya)減(jian)小(xiao)(xiao),若內(nei)阻(zu)(zu)上的(de)(de)壓(ya)降過大(da),甚(shen)至會(hui)導致RL無(wu)法獲(huo)得額定(ding)工(gong)作電(dian)(dian)(dian)壓(ya)而(er)無(wu)法正(zheng)常工(gong)作,故我們希望(wang)電(dian)(dian)(dian)瓶的(de)(de)內(nei)阻(zu)(zu)越小(xiao)(xiao)越好,以便在帶動重負(fu)載(zai)(zai)時(shi),內(nei)阻(zu)(zu)上不(bu)會(hui)產生明顯的(de)(de)壓(ya)降。
電(dian)(dian)瓶的(de)內(nei)阻(zu)(zu)會隨著使(shi)(shi)用時間的(de)增長而(er)變大(da),尤其是快報廢的(de)電(dian)(dian)瓶,內(nei)阻(zu)(zu)顯著增大(da),此時雖然充滿電(dian)(dian)后電(dian)(dian)瓶電(dian)(dian)壓較高,但由(you)于(yu)內(nei)阻(zu)(zu)變得(de)較大(da),一(yi)接(jie)上大(da)電(dian)(dian)流負(fu)載,內(nei)阻(zu)(zu)上便會產生較大(da)的(de)壓降(jiang),從而(er)使(shi)(shi)負(fu)載兩端(duan)的(de)電(dian)(dian)壓降(jiang)低(di)。