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有一道物理题是这样的,如下图所示,滑动变阻器的滑片开始置于变阻器的中间位置①当滑片 P 向左滑动一段距离时,电流表的示数如何变化?为什么?②当滑片向右滑动呢?分析:本题中电路实际上是导体 AP 和 PB 相并
There is a physics problem like this. As shown in the figure below, the slide of the sliding rheostat starts to be placed in the middle of the varistor. 1 When the slide P slides to the left for a certain distance, how does the current meter change? Why? 2 When the slide Swipe to the right? Analysis: The circuit in this question is actually a combination of conductors AP and PB.