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有的教师对初中物理第二册(试用本)图6-31、6-32两个演示输电线上能量损失的实验提出了疑问:(1)比较输电线上电能损失多少时,要确保输送功率相等。现在实际情况是图6-32的输送功率比图6-31的来得大,所以,图6-32实验中小灯泡比图6-31实验中的亮,不足以说明后者损失的能量少。(2)在图6-31实验中,当E、F逐渐远离A、B时小灯泡确是更暗一些,但损失在输电线上的能量是否就增多呢?当E、F滑至B、
Some teachers on the junior high school physics Volume II (trial version) Figure 6-31,62 Two demonstration power line loss of energy on the test questions: (1) Comparison of transmission line power loss, to ensure that delivery Equal power. Now, the actual situation is that the transmission power of Figure 6-32 is larger than that of Figure 6-31. Therefore, the light bulb in Figure 6-32 is brighter than the experiment in Figure 6-31, which is not enough to show that the latter has less energy loss. (2) In the experiment of Fig. 6-31, the small bulbs are darker when E and F are gradually away from A and B, but whether the energy lost in the transmission line will increase? When E and F slip to B,