一、電流表接線方法
在電學實驗或電路調試中,常用到電流表來測量電流大小,使用電流表時,電流表的接線非常關鍵,一般電流表的接線有三種方法:
1、串聯法
將電(dian)(dian)(dian)流(liu)表串(chuan)聯(lian)在(zai)電(dian)(dian)(dian)路中(zhong)(zhong),以測(ce)量電(dian)(dian)(dian)路中(zhong)(zhong)的(de)電(dian)(dian)(dian)流(liu)。這種方(fang)法需要斷(duan)開電(dian)(dian)(dian)路,將電(dian)(dian)(dian)流(liu)表的(de)正負極分別接(jie)入電(dian)(dian)(dian)路中(zhong)(zhong)間,再接(jie)上(shang)電(dian)(dian)(dian)源。需要注意(yi)電(dian)(dian)(dian)流(liu)表的(de)額定電(dian)(dian)(dian)流(liu)不能小于電(dian)(dian)(dian)路中(zhong)(zhong)要測(ce)量的(de)電(dian)(dian)(dian)流(liu)。
2、并聯法
將(jiang)電(dian)流表并聯在(zai)電(dian)路(lu)(lu)中,以測(ce)量(liang)電(dian)路(lu)(lu)負載中的電(dian)流。這種方法可(ke)以在(zai)不斷開電(dian)路(lu)(lu)的情況下進行測(ce)量(liang)。需(xu)要在(zai)電(dian)路(lu)(lu)上加一個電(dian)流計支路(lu)(lu),并將(jiang)電(dian)流表的正極與(yu)負載相連(lian),將(jiang)負極與(yu)電(dian)源相連(lian)。
3、夾式法
夾(jia)式(shi)電(dian)(dian)流(liu)表可以直(zhi)接(jie)夾(jia)在被(bei)(bei)測(ce)(ce)電(dian)(dian)路(lu)的導線上,不需要斷開電(dian)(dian)路(lu)。但使(shi)用(yong)夾(jia)式(shi)電(dian)(dian)流(liu)表時(shi)需要根據其額定電(dian)(dian)流(liu)調整被(bei)(bei)測(ce)(ce)電(dian)(dian)路(lu)的負(fu)載電(dian)(dian)流(liu),以免過載損(sun)壞電(dian)(dian)流(liu)表。
二、電流表接線注意事項
1、接線的時候需要分清正負(fu)極,從正極入從負(fu)極出,不能(neng)接反。
2、電流(liu)表要和(he)負載串聯。
3、任(ren)何情況下都不能把電(dian)流表直接(jie)接(jie)到電(dian)源正負(fu)極。
三、電流表接線柱接反了會怎么樣
使(shi)用電(dian)(dian)流(liu)(liu)表時,要(yao)確(que)保電(dian)(dian)流(liu)(liu)由正(zheng)接(jie)線柱(zhu)流(liu)(liu)入,負接(jie)線柱(zhu)流(liu)(liu)出,如果電(dian)(dian)流(liu)(liu)表的(de)(de)正(zheng)負接(jie)線柱(zhu)的(de)(de)位置接(jie)反(fan)了,指針會向(xiang)左偏(pian)轉,即反(fan)向(xiang)偏(pian)轉。如果電(dian)(dian)流(liu)(liu)超出電(dian)(dian)流(liu)(liu)表的(de)(de)量程,還會導致電(dian)(dian)流(liu)(liu)表被燒壞。