“机械功率”和“机械效率”是两个极易混淆的物理概念．它们之间既有区别又有联系, 现小结如下,供同学们学习参考． 1．区别:(1)定义不同．机械功率是指机械单位时间内完成的功的多少,而机械效率则是表示有用功在总功中所占的比例;(2)表示的意义不同．机械功率是表示机械做功快慢的物理量,即机械功率越大,机械做功就越快,反 “Mechanical power” and “mechanical efficiency” are two very confusing physics concepts. There are differences and connections between them. The summary is as follows for students to learn. 1. Difference: (1) The definition is different. Mechanical power refers to how much work is done in a unit of time, while mechanical efficiency means the proportion of useful work in total work. (2) The meaning of the expression is different. Mechanical power is the physical quantity that expresses the speed of mechanical work, that is, the greater the mechanical power, the faster the mechanical work will be performed.