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1、一根导线变乾坤DIV.MyFav_1323136717718 P.MsoNormalTEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; MARGIN: 0cm 0cm 0pt; FONT-FAMILY: Times New Roman; TEXT-ALIGN: justifyDIV.MyFav_1323136717718 LI.MsoNormalTEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; MARGIN: 0cm 0cm 0pt; FONT-FAMILY: Times New Roman; T
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11、CharCharCharCharCharCharCharCharCharCharCharCharTEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 10pt; LINE-HEIGHT: 125%; FONT-FAMILY: Verdana; TEXT-ALIGN: justifyDIV.MyFav_1323136717718 DIV.CharCharCharCharCharCharCharCharCharCharCharCharCharCharCharCharCharCharCh
12、arTEXT-JUSTIFY: inter-ideograph; FONT-SIZE: 10.5pt; MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 10pt; LINE-HEIGHT: 125%; FONT-FAMILY: Verdana; TEXT-ALIGN: justifyDIV.MyFav_1323136717718 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
13、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,若一个元件被短路,另一个元件仍能工作。并联电路具有“互不影响,互不干涉”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,若一个元件被短路,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:若构成串联电路,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,只去掉一条导线(填字母)可以使三个灯变成串联,在只添加一条导线的情况下,只连接(填字母)可以使三个灯变成并联。分析:之所以说它是一个错误的电路,原因就在于导线DF把和所在的电路短路了,造成闭合开关S后,只有灯亮。要组成串联电路很容易,只需拆除导线DF。要让三灯并联,应该三灯各自在独立的线路上。点D、F、A都可以看作与电源正极相连,故C、B、E应该与电源负极相连,所以只需把E点与B相连,或把E点与C相连即可。答案:DF E、BE、C