电学综合题涵盖知识面广,难度较大,电路结构灵活多变,能考查考生运用物理知识分析解决问题的能力和运用数学手段处理物理问题的能力.本文通过具体实例谈谈处理这类问题的方法.例1如图1,电路电压恒定不变,RabR0.请分析在滑片P从a向b滑动过程中,各物理量的变化情况及各量间的关 The comprehensive topic of electricity covers a wide range of knowledge, is more difficult, the circuit structure is flexible, and can examine the ability of examinees to use physical knowledge to analyze and solve problems and the ability to use mathematical methods to deal with physical problems. This article discusses the handling of such issues through specific examples. Method 1. Example 1 As shown in Fig. 1, the circuit voltage is constant, RabR0. Please analyze the variation of each physical quantity and the relationship between the quantities during the sliding process of the sliding plate P from a to b.