题目内容
(8分)某同学在实验室测定一节干电池的电动势和内阻,实验室中有如下器材:
E.滑动变阻器乙(最大阻值100Ω)
F.定值电阻R1=100Ω
G.定值电阻R2=500Ω
H.定值电阻R3=1.5kΩ
以及导线和开关。
由于没有电压表,为此他设计了如图所示的电路完成了实验要求的测量。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250039322473341.png)
(1)为了方便并能较准确测量,滑动变阻器应选 ,定值电阻应选 。(填写各器材前的序号)
(2)若某次测量中电流表G的示数为I1,电流表A的示数为I2;改变滑动变阻器滑片的位置后,电流表G的示数为I1′,电流表A的示数为I2′。则可知此电源的内电阻r= ,电动势E= 。(用给出和测得的物理量表示)
A.待测干电池 |
B.电流表G(0~3mA,内电阻r1=20Ω) |
C.电流表A(0~0.6A,内电阻r2=0.20Ω) |
D.滑动变阻器甲(最大阻值10Ω) |
F.定值电阻R1=100Ω
G.定值电阻R2=500Ω
H.定值电阻R3=1.5kΩ
以及导线和开关。
由于没有电压表,为此他设计了如图所示的电路完成了实验要求的测量。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250039322473341.png)
(1)为了方便并能较准确测量,滑动变阻器应选 ,定值电阻应选 。(填写各器材前的序号)
(2)若某次测量中电流表G的示数为I1,电流表A的示数为I2;改变滑动变阻器滑片的位置后,电流表G的示数为I1′,电流表A的示数为I2′。则可知此电源的内电阻r= ,电动势E= 。(用给出和测得的物理量表示)
(1)D,G(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250039322781171.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250039322631035.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250039322781171.png)
试题分析:(1)正常的干电池电动势约为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003932278374.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003932294433.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003932278374.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003932325763.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003932341670.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003932356293.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003932372716.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003932387414.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003932403742.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003932419464.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250039324341004.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250039324501047.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250039322631035.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250039322781171.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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