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关于滑动变阻器引起的串联电路中电表示数变化类的问题不仅能够比较全面地考察学生对欧姆定律和电路的理解,更能反映学生运用所学知识解决实际问题的能力.因此,无论是在中考,还是在竞赛中,电表示数变化类的问题都颇受青睐.例1如图1电路,电源电压不变,开关S闭合.在滑动变阻器滑片P从a向b端移动的过程中,电流表和电压表的示数如何变化?解析:先分析电流表示数变化:当滑片P从a向b端移动时,
The problem of the change of electrical expression in series circuit caused by sliding rheostat can not only fully understand the students’ understanding of Ohm’s law and circuit, but also reflect the ability of students to apply their knowledge to solve practical problems.Therefore, , Or in the race, the electricity that the number of changes in the types of problems are quite popular.Example 1 circuit in Figure 1, the same power supply voltage, switch S is closed in the sliding rheostat sliding plate P from a to b end of the process of moving, Ammeter and voltmeter how the number of changes? Analysis: Analysis of the first analysis of the current number of changes: When the slider P from a to b-side move,