论文部分内容阅读
用易观察的量显示不易观察的量,是制作测量仪器的一个重要技术思路.2007年中考试题中,将这一思路恰当地与所学实验和仪器结合了起来,在教材已有实验的基础上,进行改进和创新,用来考查学生灵活运用知识的能力和创新能力,我们以2007年青岛市中考第9题为例,讨论这类试题的解题方法.例题(2007年青岛市中考第9题)晓丽在研究磁场对电流作用的实验中,将直导线换成一块厚度为 d、宽度为 b 的导体板.如图1所示,将电压表连在导体板的两侧,发现电压表指针发生偏转.进一步做了如下实验:
The use of easy-to-observe quantities to display unobservable quantities is an important technical idea for the production of measuring instruments. In the 2007 mid-term exam questions, this idea was properly combined with the experiments and instruments that were learned, and the teaching materials were already based on experiments. At the same time, improvement and innovation are used to examine the students’ ability to use knowledge flexibly and to innovate. We took the 9th exam of the Qingdao City Entrance Examination in 2007 as an example to discuss the problem-solving methods of this kind of questions. Examples (2007 Qingdao City Entrance Examination) 9) Xiaoli studied the effect of the magnetic field on the current, and replaced the straight conductor with a conductor plate with a thickness of d and a width of b. As shown in Figure 1, the voltmeter was connected to both sides of the conductor plate. Voltmeter pointer deflected. Further experiments were done as follows: