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电阻、电容串联或并联时,其上的电压、电流(电量)、电功率(仅限于电阻)等的关系繁多且相似,易混难记。教学中若能进行归类对比,让学生掌握其中一些规律(见附表),不仅便于记忆,也能使一些问题化难为易,兹举二例明之。例1 如图(一)所示,当合上K时,欲使电流计读数为零,R_2应为何值?(电池内阻不计)
When resistors and capacitors are connected in series or in parallel, the relationship between voltage, current (electricity), and electric power (resistance only) is numerous and similar, and they are difficult to remember. If we can classify and contrast the teaching and allow students to grasp some of the rules (see the attached table), it is not only easy to remember, but also can make some problems easier. We give two examples. Example 1 As shown in Figure (a), when K is closed, to make the ammeter reading zero, what is the value of R_2? (The battery internal resistance does not count)