为了激发学生的学习兴趣，帮助学生了解家庭电路中有时电流为什么会过大，并对保险丝的作用有进一步的了解，同时使学生懂得避免短路和超负荷用电的道理，保证家庭用电安全，初二物理第二册第１２６页安排了图１０—８和图１０—９两个演示实验。由于教师在做这两个实验时... In order to stimulate students’ interest in learning, help students understand why the current in the home circuit is too large, and have a better understanding of the role of the fuse, and at the same time enable students to understand the principle of avoiding short circuit and overloaded electricity and ensure the safety of household electricity. In the second day of Physics II, page 126, two demonstration experiments were arranged in Figure 10-8 and Figure 10-9. As teachers are doing these two experiments...