初中学生在电流表、电压表和滑动变阻器都学过以后,面对形式多样而又纷繁复杂的电路图,有的学生束手无策.既看不懂电路是串联还是并联,也不知道电流表、电压表的具体作用,即使参考其它资料,了解到一些电路识别的方法,但在具体电路中也分不清该用何种方法, When junior high school students learned about ammeters, voltmeters and sliding rheostats, they faced a variety of complicated circuit diagrams. Some students couldn’t help. They couldn’t understand whether the circuits were connected in series or in parallel, nor did they know the specifics of ammeters and voltmeters. The role, even if referring to other information, to understand some circuit identification methods, but in the specific circuit can not tell which method to use,