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如干电(dian)(dian)池、蓄电(dian)(dian)池、直流发电(dian)(dian)机等。直流电(dian)(dian)源，是维(wei)持电(dian)(dian)路中形成稳恒电(dian)(dian)压电(dian)(dian)流的(de)装置。

直流(liu)电(dian)(dian)源(yuan)有正、负两(liang)个(ge)电(dian)(dian)极，正极的电(dian)(dian)位高，负极的电(dian)(dian)位低，当两(liang)个(ge)电(dian)(dian)极与电(dian)(dian)路连通(tong)后，能够使电(dian)(dian)路两(liang)端(duan)之间维持恒(heng)定的电(dian)(dian)位差，从而在外(wai)电(dian)(dian)路中形成(cheng)由(you)正极到负极的电(dian)(dian)流(liu)。直流(liu)电(dian)(dian)源(yuan)是(shi)一种能量转(zhuan)换装置(zhi)，它把其他(ta)形式的能量转(zhuan)换为电(dian)(dian)能供(gong)给电(dian)(dian)路，以维持电(dian)(dian)流(liu)的稳恒(heng)流(liu)动。