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探究“电压规律”的六种方法

作者:宋晓楼  人气: 1030 次  时间:2011年03月02日  星级:

在物理实验中,经常要进行多次测量。但是,不同的测量要求和实验目的,多次测量的目的是不一样的。一般来说多次测量有两个目的:⑴减小实验的误差;⑵找物理规律。比如测量某一个具体的物理量的值—长度、体积、质量、密度等,多次测量就是为了取平均值以减小实验的误差;而在探究串并联电路的电流、电压特点的实验中,多次测量则是为了找出一般的物理规律,因为一次测量具有偶然性,所得到的规律不具有一般性。
  那么,在探究串联或并联电路的电压规律的实验中,如何进行多次测量呢,又有多少种方法可供选择呢?(以探究串联电路的电压规律为例)
  方法一:在探究串联电路的电压关系时,往往使用如图1所示的电路,先用电压表分别正确的测量了灯泡L1和灯泡L2两端的电压,再用电压表正确的测量出L1和L2两端的总电压(如图2);换用不同规格的灯泡再测量几次,记录实验数据,分析实验数据,得出实验结论(还可以使用图3所示的电路连接方法,同时接三个电压表进行实验)。
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