单选题-单题 较易0.85 引用1 组卷103
如图所示,电源两端电压恒定。闭合开关,灯泡L1比灯泡L2亮,则( )
![](https://img.xkw.com/dksih/QBM/2017/8/31/1764009794068480/1764730272006144/STEM/8e0dc13e-cbea-41b8-b481-69e906b27e63.png?resizew=167)
![](https://img.xkw.com/dksih/QBM/2017/8/31/1764009794068480/1764730272006144/STEM/8e0dc13e-cbea-41b8-b481-69e906b27e63.png?resizew=167)
A.L1的电阻比L2大 |
B.L1两端的电压比L2大 |
C.若L1灯丝烧断,L2两端电压不变 |
D.若L2灯丝烧断,通过L1的电流变大 |
17-18高一上·湖南益阳·开学考试
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某汽车的电源与启动电机、车灯连接的简化电路如图所示,r为定值电阻,当汽车启动时,开关S闭合,则( )
![](https://img.xkw.com/dksih/QBM/2021/12/2/2864120236318720/2864752541908992/STEM/6eafbe19-5390-421d-8955-b86dc9a01201.png?resizew=195)
![](https://img.xkw.com/dksih/QBM/2021/12/2/2864120236318720/2864752541908992/STEM/6eafbe19-5390-421d-8955-b86dc9a01201.png?resizew=195)
A.车灯变亮 |
B.电阻r两端电压变小 |
C.待稳定后,若灯L1的灯丝烧断,车灯L2变亮 |
D.待稳定后,若开关S断开,电源的总功率变大 |
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