在电路分析的问题中,经常遇到分析滑动变阻器的滑片移动时(如图1、2所示)电阻变化的题型,如何迅速正确解答这类问题呢?1两个有用的结论结论1:在图1电路中,当滑片移动时,若并联的两部分电阻相差越大,则A、B间的总电阻越小;若并联的两部分电阻相差越小,则A、B间的总电阻越大.证明 In the problem of circuit analysis, often encountered in the analysis of the sliding type of the resistance of the sliding rheostat (as shown in Figure 1, 2) resistance changes, how to quickly and correctly answer this type of problem? 1 two useful conclusions Conclusion 1 : In the circuit of Figure 1, when the slider moves, if the difference between the two parts of the resistance in parallel is greater, the total resistance between A and B is smaller; if the difference between the two parts in parallel is smaller, the difference between A and B is smaller. The greater the total resistance, the proof