将一电源与一电阻箱连接成闭合回路,测得电阻箱所消耗功率P与电阻箱读数R变化的曲线如图所示,由此可知( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/18/ec801755-ad44-4ffd-be75-0221d9157371.png?resizew=282)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/18/ec801755-ad44-4ffd-be75-0221d9157371.png?resizew=282)
A.电阻箱接入电路的电阻增大,电阻箱消耗的功率越大,电源的效率升高 |
B.电源内阻小于![]() |
C.电源电动势为45V |
D.电源最大输出功率为45W |
更新时间:2023-01-17 13:32:48
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【推荐1】如图所示的I-U图像中,直线I为某电源的电流与路端电压的关系,直线Ⅱ为某一电阻R的电流与电压特性曲线,用该电源直接与电阻R连接成闭合电路,由图像可知( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/27/57a79b3e-acdc-4193-926b-87a7041c03a7.png?resizew=170)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/27/57a79b3e-acdc-4193-926b-87a7041c03a7.png?resizew=170)
A.R阻值为2.0Ω | B.电源内阻为1.5Ω |
C.电源输出功率为3.0W | D.电源的效率为50% |
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【推荐2】如图所示电路中,电源电动势
,内阻
,定值电阻
,
,
;滑动变阻器
的取值范围为
。闭合开关S,调节滑动变阻器的滑片,使
取不同的阻值接入电路,则下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/19/2ecb961f-16e4-489d-a956-3d681467c90d.png?resizew=266)
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A.![]() ![]() ![]() |
B.![]() ![]() |
C.![]() ![]() ![]() |
D.![]() |
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【推荐1】如图甲所示的电路,其中电源电动势
,内阻
,定值电阻
,已知滑动变阻器消耗的功率P与其接入电路的阻值
的关系如图乙所示。则下列说法正确的是:( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/25/b9546ec8-c4e4-4e94-88d7-e2f4b9a3127f.png?resizew=360)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/755d19a94a37c1ad52b6e3bbad45fcb9.png)
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A.图乙中滑动变阻器的最大功率![]() |
B.图乙中![]() ![]() |
C.当电源输出功率![]() |
D.调整滑动变阻器![]() |
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【推荐2】图中电源的电动势为6V,内阻为1,R1为2,R2的最大阻值为3,下列说法中错误的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/074a672d-03ec-4110-bf59-28484fb591b4.png?resizew=171)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/074a672d-03ec-4110-bf59-28484fb591b4.png?resizew=171)
A.当R2为1时,R1消耗的功率最大 |
B.R2的阻值越小,R1消耗的功率越大 |
C.通过改变R2的阻值,路端电压的最大值为5V,最小值为4V |
D.当R2的阻值为3时,R2消耗的功率最大 |
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