学会电路分析是学好电学的关键，电路分析首先要涉及到电阻（或）灯泡的连接方式．在初中，电路虽只考串联和并联两种形式，但在很多情况下，试题千变万化，然而万变不离其宗，解题的关键都是对电阻连接方式的判定．在此举几例作简单说明．例1如图1所示，S1、S2同时闭合时则：A Learning circuit analysis is the key to learning electricity. Circuit analysis first involves the connection of the resistor (or) bulb. In junior high school, although the circuit only considers two forms of series and parallel, but in many cases, the questions are ever-changing, but never change, the key to problem solving is the determination of the resistance connection method. Here are a few examples for a brief explanation. Example 1 is shown in Figure 1. When S1 and S2 are closed at the same time: A