一根导线变乾坤

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13、23136717718 DIV.Section1page: Section1例1请在图1中改动一根导线，使它成为串联电路或并联电路。分析：这个电路存在短路危害，一旦开关闭合，电源将短路。串联电路指电路中的两个或两个以上元件，逐个顺次连接的电路。并联电路指两个或两个以上的元件并列连接的方式。串联电路具有“一荣俱荣，一损俱损的特点，假设一个元件被短路，另一个元件仍能工作。并联电路具有“互不影响，互不干预的特点，一个元件损坏，另一个元件仍能正常工作；每一元件都可以与电源构成一个回路，假设一个元件被短路，另一个元件也必然被短路。答案：去掉导线db就成为串联电路。把导线ed的点d接到点c；或者把导线bg的点b接到点a均可成为并联电路。点拨：假设构成串联电路，应没有分支点。并联电路存在分支点，“兵分两路或多路。例2如图2所示，是一个错误的电路，闭合开关S，灯亮，只去掉一条导