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功率和机械效率是初中阶段重要的两个物理概念,也是同学们容易混淆的物理概念.对功率和机械效率的概念进行梳理,对易错点进行分析将有助于同学们理解功率和机械效率.易错点1:误认为功率越大,机械效率越高功率表示物体做功的快慢,功率大指物体单位时间内做的功多:机械效率表示有用功占总功的比值,机械效率高则表示有用功占总功的比值大.两者之间没有必然联系,不
Power and mechanical efficiency are two important physics concepts in the junior middle school and also a confusing physical concept for students.Classification of the concepts of power and mechanical efficiency and the analysis of error-prone points will help students to understand the power and mechanical efficiency . Error-prone 1: mistakenly believe that the greater the power, the higher the mechanical efficiency Power that the speed of work done, the power refers to the work done in the unit of time and more: the mechanical efficiency that the total work of useful power ratio, high mechanical efficiency That useful work accounted for a large proportion of total work, there is no necessary link between the two, no