小华家住在靠近胡同口,因为没有路灯,晚上经常有人磕碰或摔倒。前天,后院的张伯伯就在胡同口崴了脚,至今还不能上班,小华学习了电路的知识后,萌生了在胡同口装一只照明灯的想法。说干就干,小华买来开关、灯具、电线。他仔细观察家里的线路,发现从自己的卧室里的照明线路上接线 Xiaohua’s family lives near the mouth of Hutong because there are no street lights and people often bump or fall at night. The day before yesterday, Zhang Bobo in the backyard had been stumped in the hutong mouth, and he was still unable to go to work. After Xiaohua learned the knowledge of the circuit, he began to think of installing an illuminator in the mouth of the hutong. Say dry, Xiaohua buy switches, lamps, wires. He carefully observed the line at home and found that he was wiring from the lighting line in his bedroom