近年来,全国很多地方电力供应紧张。在我们教室和家里发生停电现象时,人们往往忘记关闭照明开关。当教室或家里恢复供电时,照明灯也就亮起来了,由于没有人在场,既浪费电又可能引发事故。能否发明一种开关,即使恢复供电,开关处于开启状态,也不会点亮照明灯呢?我设想利用电子元器件把现有的两触点按键式开关改制成停电保险开关,实现来电时的自动断电保护。 In recent years, electricity supply has been strained in many parts of the country. When blackouts occur in our classrooms and homes, people often forget to turn off the light switch. When the classroom or home recovers power, the lights will come on. Because no one is present, it will waste electricity and cause accidents. Can you invent a switch that will not light the lamp even if power is restored and the switch is turned on? I envisage the use of electronic components to replace the existing two-contact pushbutton switch with a power failure cutout to achieve an incoming call. Automatic power-off protection.