题目内容
某研究小组收集了两个电学元件:电阻R0(约为2kΩ)和手机中的锂电池(电动势E标称值为3.7V,允许最大放电电流为100mA)。实验室备有如下器材:
A.电压表V(量程3V,电阻RV约为4.0kΩ)
B.电流表A1(量程100mA,电阻RA1 约为5Ω)
C.电流表A2(量程2mA,电阻RA2约为50Ω)
D.滑动变阻器R1(0~40Ω,额定电流1A)
E.电阻箱R2(0~999.9Ω)
F.开关S一只、导线若干
①为了测定电阻R0的阻值,小明设计了一电路,如图甲所示为其对应的实物图,
(i)甲图中的电流表A应选 (选填“A1”或“A2”).
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082415424783114653.png)
(ii)请将甲图实物连线补充完整.
②为测量锂电池的电动势E和内阻r,小红设计了如图乙所示的电路图。根据测量数据作出
图象,如图丙所示。若该图线的斜率为k,纵轴截距为b,则该锂电池的电动势E= ,内阻r = (用k、b和R2表示)。![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241542481593882.jpg)
A.电压表V(量程3V,电阻RV约为4.0kΩ)
B.电流表A1(量程100mA,电阻RA1 约为5Ω)
C.电流表A2(量程2mA,电阻RA2约为50Ω)
D.滑动变阻器R1(0~40Ω,额定电流1A)
E.电阻箱R2(0~999.9Ω)
F.开关S一只、导线若干
①为了测定电阻R0的阻值,小明设计了一电路,如图甲所示为其对应的实物图,
(i)甲图中的电流表A应选 (选填“A1”或“A2”).
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082415424783114653.png)
(ii)请将甲图实物连线补充完整.
②为测量锂电池的电动势E和内阻r,小红设计了如图乙所示的电路图。根据测量数据作出
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154247972565.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241542481593882.jpg)
(1)A2(2分)
(2)如图(2分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241542483936996.jpg)
(3)
(2分)
(2分)
(2)如图(2分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241542483936996.jpg)
(3)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154248408317.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154248471378.png)
试题分析:(i)此电路中的电流近似等于:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241542485801054.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241542487051116.png)
纵截据表示
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154248861357.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154248408317.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154249204593.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824154248471378.png)
点评:难度中等,此类题型考察了结合实验目的而设计实验电路,并根据电路图理解图像的能力
![](http://thumb2018.1010pic.com/images/loading.gif)
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