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4个开关闭合后灯泡被短路，不会亮，只要一个不合上灯泡就没被短路，就会亮，这种连法缺点是消耗电能多。
四个开关串联后和灯泡，电阻并联，最后接上电池。
可以使用两套电路啊
一条是电磁铁与四个开关，如果都开关闭合电磁铁产生磁场。另一条将开关放在电磁铁上面然后将灯电源依次串联。如果电磁铁产生磁场将吸引开关使开关闭合则灯亮
四个开关相互并联后再与灯泡串联在与电阻串联在与电池串联就是了
并联电路
干路:电池
支路:1)灯泡
2)4个开关
4个开关串联，灯并联在开关首尾，电阻串联入电路，电池连入电路
电阻 灯
┌□——————¤———┐
│ └／－／－／－／－┘│
│ 开关 │ 4个开关串联后与灯泡并联，然后与电阻串联后接到电池两端。
4个开关闭合后灯泡被短路，不会亮，只要一个不合上灯泡就没被短路，就会亮，这种连法缺点是消耗电能多。
└————电池—————┘
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