单选题-单题 适中0.65 引用5 组卷645
如图所示,因线路故障,按通K时,灯L1和L2均不亮,用电压表测得Uab=0,Ubd=0,Ucd=4V。由此可知开路处为( )
![](https://img.xkw.com/dksih/QBM/2021/11/21/2856260799291392/2856731211063296/STEM/5d005f43-7077-4496-8a9b-17462c78f06a.png?resizew=157)
![](https://img.xkw.com/dksih/QBM/2021/11/21/2856260799291392/2856731211063296/STEM/5d005f43-7077-4496-8a9b-17462c78f06a.png?resizew=157)
A.灯L1 | B.灯L2 | C.变阻器 | D.电源 |
21-22高二上·四川绵阳·期中
类题推荐
如图所示的电路中,电源电动势为6V,当开关S接通后,灯泡L1和灯泡L2都不亮,用电压表测得各部分电压是Uab=0,Uad=0,Ucd=6V,由此可断定( )
![](https://img.xkw.com/dksih/QBM/2021/12/25/2887360474447872/2888000300974080/STEM/6bba3b41-382d-4dff-8778-531c5ac6b822.png?resizew=138)
![](https://img.xkw.com/dksih/QBM/2021/12/25/2887360474447872/2888000300974080/STEM/6bba3b41-382d-4dff-8778-531c5ac6b822.png?resizew=138)
A.L1和L2的灯丝都烧断了 |
B.L1的灯丝都烧断了 |
C.L2的灯丝都烧断了 |
D.变阻器R断路 |
如图所示电路中电源电动势为3V,当开关S接通后,灯泡L1和L2都不亮,用电压表测得各部分电压是Uab=3V,Ubc=3V,Ucd=0V,由此可以断定( )
![](https://img.xkw.com/dksih/QBM/2018/11/19/2078909015138304/2080824967913472/STEM/f8b89d40-6ec9-48f5-83d2-3a1778919932.png?resizew=147)
![](https://img.xkw.com/dksih/QBM/2018/11/19/2078909015138304/2080824967913472/STEM/f8b89d40-6ec9-48f5-83d2-3a1778919932.png?resizew=147)
A.变阻器R断路 | B.L1的灯丝烧断了 |
C.L2的灯丝烧断了 | D.L1和L2的灯丝都烧断了 |
如图所示,电源电动势为12V,当开关接通时,灯泡L1和L2都不亮,用电压表测得各部分电压Uad=0 V 、Ubd=12V,由此可以判断( )
![](https://img.xkw.com/dksih/QBM/2019/3/5/2153761579442176/2156736994467840/STEM/cc9e813f-bc0f-4213-b337-0aac28a81863.png?resizew=183)
![](https://img.xkw.com/dksih/QBM/2019/3/5/2153761579442176/2156736994467840/STEM/cc9e813f-bc0f-4213-b337-0aac28a81863.png?resizew=183)
A.可能是L1和L2的灯丝都断了 |
B.可能是 L2灯丝断了 |
C.可能是L1的灯丝断了 |
D.可能是变阻器R断路 |
组卷网是一个信息分享及获取的平台,不能确保所有知识产权权属清晰,如您发现相关试题侵犯您的合法权益,请联系组卷网