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# 恒定电流 - PowerPoint PPT Presentation

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1、形成：

2、导体中存在持续电流的条件：

3、性质：标量

4、方向：规定正电荷定向移动的方向为电流的方向

①导体中电流方向：从电势高处流向电势低处

②电源：内部从电势低处流向电势高处

• 电源是维持导体两端稳定电压的装置

n为单位体积内自由电荷数，q为单个自由电荷的电荷量，s为导线横截面积，v为自由电荷定向移动速率

n

5、分类：

①直流电：电流方向不随时间变化而改变的电流叫直流电.

②交流电：大小、方向随时间作周期变化的电流叫交流电.

(A)nvSΔt (B)nvΔt (C)IΔt/e (D)IΔt/Se