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人教版教科书高中《物理》(必修3—1)第二章《恒定电流》第10节“实验:测定电池的电动势和内阻”课后习题第2题的命题不够科学;第3题的实验原理图用的是第2题的电路图,题目里给定的数据也有问题。教材题目如下:题1(第2题)用图1(教材图2.10-6)的电路测量一节蓄电池的电动势和内阻。蓄电池的内阻非常小,为防止滑动变阻器电阻过小时由于电流过大而损害器材,电路中用了一个保护电阻R_0,除蓄电池、滑动变阻器、开关、导线外,可供使用的实验器材还有:
People’s Education Edition textbook High School “Physics” (compulsory 3-1) Chapter second “constant current” Section 10 “experiment: determination of battery electromotive force and internal resistance, ” after the second exercises proposition is not enough science; Article 3 The experimental schematic diagram of the problem is the circuit diagram of the second problem, the problem given the data in the title. Textbook topics are as follows: Question 1 (Question 2) Figure 1 (textbook Figure 2.10-6) circuit measurement of a battery electromotive force and internal resistance. Battery internal resistance is very small, in order to prevent sliding rheostat resistance is too small due to excessive current damage to equipment, the circuit used a protective resistor R_0, in addition to battery, sliding rheostat, switch, wire, the experimental equipment available :