单选题-单题 较易0.85 引用5 组卷651
如图所示,理想变压器原、副线圈匝数比n1: n2=2:1,分别接有额定电压为U的相同的两只灯泡A、B且灯泡电阻不随电流变化。若B灯恰能正常发光,则电源输出电压为( )
![](https://img.xkw.com/dksih/QBM/2020/12/16/2615598995464192/2617056040124416/STEM/9c0bc5ee-496d-41aa-9320-8abc2a355c91.png?resizew=166)
![](https://img.xkw.com/dksih/QBM/2020/12/16/2615598995464192/2617056040124416/STEM/9c0bc5ee-496d-41aa-9320-8abc2a355c91.png?resizew=166)
A.3U | B.1.5U | C.2U | D.2.5U |
20-21高二上·辽宁·阶段练习
类题推荐
如图所示,理想变压器原,副线圈分别接有额定电压相同的灯泡a和b。当输入电压U为灯泡额定电压的8倍时,两灯泡均能正常发光。下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/1/30/2647301304172544/2648660082302976/STEM/6be0648c-e0ef-4a1e-bb9e-d1847cfb2b74.png?resizew=255)
![](https://img.xkw.com/dksih/QBM/2021/1/30/2647301304172544/2648660082302976/STEM/6be0648c-e0ef-4a1e-bb9e-d1847cfb2b74.png?resizew=255)
A.原、副线圈匝数之比为8:1 |
B.原、副线圈匝数之比为1:8 |
C.a和b的电功率之比为1:7 |
D.变压器的输入功率和输出功率之比是1:7 |
如图所示,灯泡A、B完全相同,理想变压器原副线圈匝数比n1:n2=5:1,指示灯L的额定功率是灯泡A的
,当输入端接上
的交流电压后,三个灯泡均正常发光,两个电流表均为理想电流表,且A2的示数为0.4A,则( )
![](https://img.xkw.com/dksih/QBM/2020/3/16/2420578953592832/2420677616230400/STEM/4f5306e8-07d5-4f68-9c95-50da03673b5d.png?resizew=192)
![](https://img.xkw.com/dksih/QBM/2020/3/16/2420578953592832/2420677616230400/STEM/4f5306e8-07d5-4f68-9c95-50da03673b5d.png?resizew=192)
A.电流表A1的示数为0.08A |
B.灯泡A的额定电压为22V |
C.灯泡L的额定功率为0.8W |
D.原线圈的输入功率为8.8W |
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