为什么串联电路电流处处相等

2024年11月23日 04:44
有4个网友回答
网友(1):

1.电流实际上是电荷的定向运动,而电荷之所以会运动,是因为受到了电场对它的力的作用。在串联电路中导体中形成的电场是稳定的匀强电场(电路中的大小处处相等),方向顺着导线。电荷在匀强电场下运动情况也是处处相同的,所以电流也就处处相同的。在这一电场由导体内各个电器、电源、自由电荷本身在很短时间内共同形成的。因此,不管你串联进去的电阻多大,最终都会和其它元件一起形成稳定的电场,导致电流相同。

网友(2):

“假设最简单的情况:一个直流电源接一根纯导线,这根导线电阻不是处处相等,为什么电流是处处相等的?”直流——或称恒定电流,在此条件下则必然串联电路各处电流相等。若不等,设两点电流i1和i2,其间的电荷为(i1-i2)t(其中t是时间),则电荷将不再守恒(注意i1和i2为常数且不等)。

网友(3):

因为电流只有一条路,不会减少,也不会分流。

网友(4):

因为没有其他用电器或电阻来分流。

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