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2.電流的本性在進而講解電流的本性就是電荷的定向運動時,我們的方案是從考查引入電場的導線來開始講解的,在這里强調指出,導線中的電荷的移動是在電場力的作用下進行的,這個導線中的電場力一直存在到導線兩端間的電勢差消失時為止。實際上,在導線中電勢趨於一致是瞬時的事情,但如果我們用兩個靜電計,事先使其中的一個帶電,在它们上面分别固定一個小球,並用半導體來連通小球(圖5),那我們
2. The nature of the current To explain the nature of the current is the directional movement of the charge, our program begins by examining the wires that introduce the electric field, emphasizing here that the movement of the charge in the wire is at the electric field force Under the action, the electric field force in this wire is always present until the potential difference between the ends of the wire disappears. In fact, it is a momentary matter that the potentials in the wires tend to be uniform, but if we use two electrometers, one of them is charged in advance, a small ball is fixed on each of them, and the ball is connected by semiconductors (Figure 5) Then we