题目内容
实际电流表有内阻,可等效为理想电流表与电阻的串联。现在要测量实际电流表
的内阻
。供选择的仪器如下:
A.待测电流表
(
,内阻约300Ω)
B.电流表
(
,内阻约100Ω)
C.电压表V1(量程6V)
D. 电压表V2(量程15V)
E.滑动变阻器
(
Ω)
F.滑动变阻器
(
Ω)
G. 定值电阻
(300Ω)
H. 定值电阻
(10Ω)
I. 直流电源(E=3V)
J. 电键S及导线若干 。
小题1:请选择合适的器材设计实验电路,并把电路图画在方框中 (图中表明所选器材)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241255275131837.jpg)
小题2:根据测量所得物理量有
= 。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125527076223.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125527123196.gif)
A.待测电流表
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125527076223.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125527326405.gif)
B.电流表
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125527357230.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125527388421.gif)
C.电压表V1(量程6V)
D. 电压表V2(量程15V)
E.滑动变阻器
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125527404219.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125527420292.gif)
F.滑动变阻器
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125527435220.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125527451281.gif)
G. 定值电阻
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125527466218.gif)
H. 定值电阻
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125527482220.gif)
I. 直流电源(E=3V)
J. 电键S及导线若干 。
小题1:请选择合适的器材设计实验电路,并把电路图画在方框中 (图中表明所选器材)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241255275131837.jpg)
小题2:根据测量所得物理量有
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125527123196.gif)
小题1:如图所示
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241255275444293.jpg)
小题2:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125527560426.gif)
按照伏安法测电阻的原理,用两个电流表测量待测电流表
内阻,电路如图所示。由I1r1=(I2-I1)R1解得r1=
。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125527076223.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824125527560426.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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