单选题-单题 较易0.85 引用3 组卷183
如图所示电路中灯泡L1、L2不亮,但电路中只有一处断开.今用电压表测得Uab=0,Uac =3V,Ubd =3V,Ucd =0,则可知( )
![](https://img.xkw.com/dksih/QBM/2018/1/16/1861537472110592/1868016226951168/STEM/7615add8-3585-4ec8-93c8-5b6ce3106e91.png?resizew=279)
![](https://img.xkw.com/dksih/QBM/2018/1/16/1861537472110592/1868016226951168/STEM/7615add8-3585-4ec8-93c8-5b6ce3106e91.png?resizew=279)
A.L2断 |
B.L1断 |
C.R断 |
D.电键K未接通 |
18-19高二上·甘肃天水·期末
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如图所示,电源电动势E=6V,内阻r=1Ω,电阻
,
,
,电容器电容C=4μF,开关S原来断开,现在合上开关S到电路稳定,则( )
![](https://img.xkw.com/dksih/QBM/2016/10/4/1575934370988032/1575934371364864/STEM/1111db22-5125-431a-890f-a9524f014a64.png?resizew=193)
![](https://img.xkw.com/dksih/QBM/2016/10/4/1575934370988032/1575934371364864/STEM/1111db22-5125-431a-890f-a9524f014a64.png?resizew=193)
A.S断开时电容器的电压为3V |
B.S断开时电容器a极板带负电 |
C.S合上电路稳定后电容器b极板带负电 |
D.从S断开到合上开关S且电路稳定后,流过电流表的电量为 |
如图所示,电源电动势E=6V,内阻r=1Ω,电阻R1=2Ω,R2=3Ω,R3=7.5Ω,电容器电容C=4μF,开关S原来断开,现在合上开关S到电路稳定,则( )
![](https://img.xkw.com/dksih/QBM/2017/10/20/1799561429213184/1800035004063744/STEM/e926ff51-157b-40da-a72d-bb0d06e40d70.png?resizew=155)
![](https://img.xkw.com/dksih/QBM/2017/10/20/1799561429213184/1800035004063744/STEM/e926ff51-157b-40da-a72d-bb0d06e40d70.png?resizew=155)
A.S断开时电容器a极板带正电 |
B.S断开时电容器的电压为3V |
C.从S断开到合上开关S且电路稳定后,流过电流表的电量为5.2×10-6 C |
D.从S断开到合上开关S且电路稳定后,流过电流表的电量为1.92×10-5 C |
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