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笔者在讲授人教版普通高中课程标准实验教科书《物理3一1》(下面统称《物理3—1》)时发现了几处有争议的地方,现整理如下:一、关于电场中两点间电势的差值的表述《物理3—1》第20页有这么一句话:电场中两点间电势的差值叫做电势差,也叫电压。分析假设电场中A、B两点的电势分别为φ_A、φ_B,则A、B两点的电势差可以表示成U_(AB)=φ_A-φ_B,当φ_A<φ_B时,U_(AB)<0,即A、B两点间的电势差小于零。按照课本的说法:电势差也叫电压,则此时A、B两点间的电压也小于零。然而,我们平时很少听到电
The author found that there were several controversial places when teaching the PEP general senior high school curriculum standard experimental textbook “Physics 3 to 1” (hereinafter collectively referred to as “Physics 3-1”), and is organized as follows: I. About the difference between two points in the electric field The expression of the potential difference “Physics 3-1” Page 20 There is such a sentence: the difference between the electric potential in two points is called potential difference, also called voltage. Assuming that the electric potentials of the two points A and B in the electric field are φ_A and φ_B respectively, the potential difference between the two points A and B can be expressed as U AB = φ_A - φ_B. When φ_A <φ_B, U_AB <0, That A, B potential difference between two points is less than zero. According to textbook argument: Potential difference is also called voltage, then the voltage between A and B is also less than zero. However, we rarely hear electricity