电路设计是初中物理电学的重点和难点 ,主要考查学生灵活运用串并联电路的知识解决实际问题的能力 ,同时也考查了学生设计作图的水平 ,所以学生普遍感到较难。我通过多年的教学实践 ,采用类似于数学的“提公因式法” ,用于电路设计的教学中 ,学生较容易接受 ,使这类题的难度大 Circuit design is the focus and difficulty of junior high school physics. It mainly examines the students’ ability to flexibly apply the knowledge of serial and parallel circuits to solve practical problems. At the same time, it also examines the level of student’s design drawing. Therefore, students generally find it more difficult. Through many years of teaching practice, I adopted the “Public Reasoning Method”, which is similar to mathematics, for the teaching of circuit design. Students are more likely to accept it, making such questions more difficult.