“等效”是高中物理的一种重要的思维方法,如合力与分力的等效替换、等效摆长、等效重力加速度、变压器中的等效负载电阻等,都采用了等效的思想,这对学生理解物理概念、解决物理问题起到了促进和简化作用。在闭合电路中常会遇到电源和电阻串联或并联以对其它用电器供电,此时我 Equivalence is an important way of thinking in high school physics. Equivalent substitutions of synergy and force, equivalent swing length, equivalent gravitational acceleration, and equivalent load resistance in a transformer all use the equivalent Thought, which is to promote and simplify the students to understand the concept of physics and solve physical problems. In the closed circuit often encounter power and resistance in series or in parallel to other electrical power supply, this time I