解答题 适中0.65 引用2 组卷574
如图所示,理想变压器原、副线圈的匝数之比n1∶n2=2∶1,L1是“100 V,40 W”的灯泡,L2和L3均为“220 V,100 W”的灯泡,当L1正常发光时,求变压器的输入功率.
![](https://img.xkw.com/dksih/QBM/2016/12/6/1826279592861696/1826279592935424/STEM/6d94b35859504ed88877b984dd60d477.png)
![](https://img.xkw.com/dksih/QBM/2016/12/6/1826279592861696/1826279592935424/STEM/6d94b35859504ed88877b984dd60d477.png)
2016高二·全国·课时练习
类题推荐
如图所示为理想变压器,三个灯泡L1、L2、L3都标有“4 V,4 W”,灯泡L4标有“4 V,8 W”,若它们都能正常发光,则变压器原、副线圈匝数比n1∶n2和ab间输入电压为( )
![](https://img.xkw.com/dksih/QBM/2020/1/28/2386758638411776/2387018749927424/STEM/76a5345e-377f-4875-8457-d146ac0de2b4.png?resizew=228)
![](https://img.xkw.com/dksih/QBM/2020/1/28/2386758638411776/2387018749927424/STEM/76a5345e-377f-4875-8457-d146ac0de2b4.png?resizew=228)
A.2∶1,16 V | B.2∶1,20 V | C.1∶2,16 V | D.1∶2,20 V |
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