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初中物理第二册156页习题二中的第4题,“上题中(指习题二第3题),安培表用的0-0.6A档,伏特表用的是0-15v档,各表指针指示位置如图8-15所示,那么上题中小灯泡里的电流强度和小灯泡两端的电压各是多大?能否换用安培表、伏特表的另一量程来测小灯泡的电流、电压?”在教学中我们发现大部分学生认为是可以换用的,理由是图中的安培表示数为0.5A,没有超过0-3A档量程。这样的理由是不充足的,应当还要
The fourth question in the second essay of junior high school physics book 156, "In the title (refer to the second question of the second problem), the 0-0.6A file for the ampere meter, and the 0-15v file for the volt meter, each table The position of the pointer indicates as shown in Figure 8-15. What is the current intensity in the small and medium bulbs and the voltage across the bulb? Is it possible to change the amperage or voltmeter to measure the current of the bulb? In the teaching, we find that most students think that they can switch to it. The reason is that the number of amps in the figure is 0.5A, which does not exceed 0-3A range. This reason is not sufficient, it should be