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> 一只木盒上有两盏灯L 1、L 2，一个开关S，一组电池组成了一个电路，当合上开关S时，L 1发光，L 2不发光；当断开开关时S时，L 1和L 2都能发光．试在下边虚线框内画出符合题意的电路图．

问题：

发布时间：2024-09-11

一只木盒上有两盏灯L ₁、L ₂，一个开关S，一组电池组成了一个电路，当合上开关S时，L ₁发光，L ₂不发光；当断开开关时S时，L ₁和L ₂都能发光．试在下边虚线框内画出符合题意的电路图．

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