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(jiang)電(dian)(dian)(dian)流表(biao)串聯在電(dian)(dian)(dian)路中，以測(ce)量電(dian)(dian)(dian)路中的電(dian)(dian)(dian)流。這種方法需(xu)要斷開電(dian)(dian)(dian)路，將(jiang)電(dian)(dian)(dian)流表(biao)的正負(fu)極(ji)分別接(jie)入電(dian)(dian)(dian)路中間，再接(jie)上電(dian)(dian)(dian)源。需(xu)要注意電(dian)(dian)(dian)流表(biao)的額定電(dian)(dian)(dian)流不能(neng)小于電(dian)(dian)(dian)路中要測(ce)量的電(dian)(dian)(dian)流。

2、并聯法

將電(dian)(dian)(dian)流表并(bing)聯在電(dian)(dian)(dian)路中(zhong)(zhong)，以(yi)測量(liang)電(dian)(dian)(dian)路負載中(zhong)(zhong)的(de)電(dian)(dian)(dian)流。這種(zhong)方法可以(yi)在不斷開電(dian)(dian)(dian)路的(de)情況下進(jin)行測量(liang)。需要在電(dian)(dian)(dian)路上加一個電(dian)(dian)(dian)流計支路，并(bing)將電(dian)(dian)(dian)流表的(de)正(zheng)極(ji)與(yu)負載相連，將負極(ji)與(yu)電(dian)(dian)(dian)源相連。

3、夾式法

夾(jia)式(shi)電(dian)(dian)流(liu)(liu)表(biao)可以直接夾(jia)在(zai)被測電(dian)(dian)路的導線上，不需(xu)要斷(duan)開電(dian)(dian)路。但使(shi)用夾(jia)式(shi)電(dian)(dian)流(liu)(liu)表(biao)時需(xu)要根據其額定電(dian)(dian)流(liu)(liu)調整(zheng)被測電(dian)(dian)路的負載電(dian)(dian)流(liu)(liu)，以免過(guo)載損壞電(dian)(dian)流(liu)(liu)表(biao)。

二、電流表接線注意事項

1、接線的時(shi)候需(xu)要分清(qing)正負極(ji)，從正極(ji)入從負極(ji)出，不能接反(fan)。

2、電(dian)流表要和負載串聯。

3、任(ren)何情況(kuang)下都不能把電流表直接接到電源正負(fu)極。

三、電流表接線柱接反了會怎么樣

使用電(dian)(dian)流(liu)(liu)表(biao)時，要確保電(dian)(dian)流(liu)(liu)由(you)正接(jie)(jie)線(xian)(xian)柱(zhu)流(liu)(liu)入，負接(jie)(jie)線(xian)(xian)柱(zhu)流(liu)(liu)出，如果(guo)電(dian)(dian)流(liu)(liu)表(biao)的(de)正負接(jie)(jie)線(xian)(xian)柱(zhu)的(de)位置(zhi)接(jie)(jie)反(fan)了，指針會向左偏轉，即反(fan)向偏轉。如果(guo)電(dian)(dian)流(liu)(liu)超(chao)出電(dian)(dian)流(liu)(liu)表(biao)的(de)量程，還(huan)會導致(zhi)電(dian)(dian)流(liu)(liu)表(biao)被燒壞。