如图所示,将一根粗细均匀的电阻丝弯成一个闭合的圆环,接入电路中,电路与圆环的接触点O点固定,P为电路与圆环良好接触的滑动触头,电源的电动势为E,内阻为r,闭合开关S,在滑动触头P缓慢地从m点开始经n点移到q点的过程中,下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/16/f18b834f-f1f5-4f47-a7d0-6a031e57cb36.png?resizew=255)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/16/f18b834f-f1f5-4f47-a7d0-6a031e57cb36.png?resizew=255)
A.电压表和电流表的示数都一直变大 |
B.灯![]() |
C.灯![]() |
D.电容器C所带电荷量先减少后增多 |
更新时间:2023-01-14 22:43:33
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【推荐1】如图,电路中定值电阻阻值R大于电源内阻阻值r。闭合开关后,将滑动变阻器滑片向下滑动,理想电压表V1、V2、V3示数变化量的绝对值分别为
、
、
,理想电流表示数变化量的绝对值为
,则( )
![](https://img.xkw.com/dksih/QBM/2021/1/6/2630388640030720/2633146573774848/STEM/95ae5fd4-429d-47e0-b20b-2e65074789cd.png?resizew=308)
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![](https://img.xkw.com/dksih/QBM/2021/1/6/2630388640030720/2633146573774848/STEM/95ae5fd4-429d-47e0-b20b-2e65074789cd.png?resizew=308)
A.![]() |
B.![]() |
C.电源输出功率先增大后减小 |
D.![]() ![]() |
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【推荐2】如图所示电路中,电源电动势为E,内电阻不能忽略。闭合S后,调整R的阻值,使电压表的示数增大
,则( )
![](https://img.xkw.com/dksih/QBM/2021/1/3/2628249907011584/2629433183191040/STEM/59e8cf5ac77f45d7ac358e6015d6ac91.png?resizew=154)
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A.通过R的电流增大 | B.![]() ![]() |
C.通过![]() ![]() | D.路端电压增大,增大量为![]() |
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【推荐1】如图所示,电源电压保持不变,内阻不可忽略,
为定值电阻,滑动变阻器
的最大阻值与
阻值相等。当滑动变阻器的滑片向右滑动时,下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/3/e71d08fa-7acb-47b9-b66c-55de85dcae1e.png?resizew=165)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/3/e71d08fa-7acb-47b9-b66c-55de85dcae1e.png?resizew=165)
A.电压表示数增大 | B.电源的发热功率减小 |
C.![]() | D.![]() |
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【推荐2】如图所示的电路中,电源内阻不可忽略。开关S闭合后,在滑动变阻器R2的滑动触片由a向b缓慢移动的过程中,下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2022/1/12/2899952563347456/2901522420203520/STEM/ac9e31cc-3dbd-4e4f-88a5-b6c9455d728e.png?resizew=193)
![](https://img.xkw.com/dksih/QBM/2022/1/12/2899952563347456/2901522420203520/STEM/ac9e31cc-3dbd-4e4f-88a5-b6c9455d728e.png?resizew=193)
A.R1的电功率增大 |
B.电压表的示数增大 |
C.电流表的示数增大 |
D.电容器C所带的电荷量减小 |
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