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同学们,你留意过教室里的日光灯吗?是否发现过这样的现象：某一盏灯不亮,而其余的灯照常发光．这是怎么回事?你家里的冰箱停止工作时,卧室里的电视能收看吗?为了节约用电,许多教学楼的楼梯过道灯是由光控开关和声控开关同时控制的,光控开关受到光照射时断开,声控开关接收到声音时闭合．你会发现：在夜晚天黑时,用力拍掌,灯就发光；在白天无论怎么用力拍掌,灯都不亮．光控开关和声控开关是怎样连接的呢?学过串、并联电路的知识以后,所有这些问题你都能一一解决了．
Students, have you noticed the fluorescent lamps in the classroom? Have you ever found out that a certain light does not shine and the rest of the lights glow as usual? How is this going to happen? When the refrigerator in your home stops working, can the TV in the bedroom be able to watch? In order to save electricity, many stairwell lights in the school building are controlled by the light control switch and the voice-activated switch. The light control switch receives When the light is off, the voice switch closes when it receives the sound. You will find that in the darkness of the night, the palms of the hand will slap and the light will shine; no matter how hard you clap during the day, the lights will not shine. How is the light control switch and the voice control switch connected? After learning the knowledge of string and parallel circuits, you can solve all these problems one by one.