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电学多项选择题不但能考查学生对电学公式的掌握情况,还能考查学生识别串并联电路及电表的测量对象的能力,故此类型题综合性较强。笔者根据多年的教学实验,总结出下面的求解方法,希望对同学们有所助益。 现以1996年河北省中考一道电学多选题为例,谈一下解这类题的方法。 题目:如图1所示,AB间的电压为3伏,电阻R_1=20欧,R_2=R_3=40欧,则( )。
Electric multiple-choice questions can not only examine the students’ mastery of the electric formula, but also examine the ability of students to identify the serial and parallel circuits and the measuring object of the electric meter. Therefore, this type of question is more comprehensive. Based on many years of teaching experiments, the author summarizes the following solutions and hopes to help the students. Take the example of a multiple-choice elective test in the province’s entrance examination in Hebei Province in 1996, and discuss ways to solve such problems. Title: As shown in Figure 1, the voltage across AB is 3 volts, and the resistance R_1 = 20 ohms, R_2 = R_3 = 40 ohms, then ().