在物理教学中,我们常常遇到学生提出这样的问题,手电筒里的电池反装后一定可以防止耗电吗?对这个问题有的学生根据合上开关后,灯泡亮与不亮来判断是否耗电,这种判断是不正确的,我们应该利用高中物理的全电路欧姆定律来回答这个问题.一般的手电筒,有使用一节电池的,也有用两节电 In physics teaching, we often encounter the students to ask such a question, the battery in the flashlight can prevent power consumption after anti-loading? For this problem, some students according to close the switch, the light bulb does not light to determine whether to consume Electricity, this judgment is not correct, we should use full-circuit Ohm’s law of high school physics to answer this question. The general flashlight, there is a battery, but also with two electricity