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2.1 电源和电流 PowerPoint PPT Presentation


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2.1 电源和电流. 雷鸣电闪时 , 强大的电流使天空发出耀眼的闪光 , 但它只能存在于一瞬间 , 而手电筒中的小灯泡却能持续发光 , 这是为什么 ?. 一、电源. 1 、电流的形成. 导体中的自由电荷在电场力的作用下发生定向移动形成电流 . ( 瞬时电流 ). 2 、持续电流的形成 倘若在 A,B 之间连接一个装置 P, 作用是不断地把电子从 A 搬运到 B ,使 AB 之间始终存在一定的电场,从而保持持续电流。. 装置 P  电源. -. -. +. _. _. A. +. +. A. B. _. A. _. B. +. +.

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2.1 电源和电流

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