一、命题意图概述纵观近三年的各地物理中考试题,热量的计算作为初中物理的重点,频频被中考命题者用来考查学生.这一知识点往往是结合生产和生活实际、现代科技以及社会热点问题创设物理情景.主要考查热量计算公式,热值计算公式、效率计算公式的理解和应用.特别是大力提倡节能减排、绿色环保的今天,“效率”这个词出现的频率越来越大,“效率题”正逐渐成为物理中考的新宠,且多在试卷的最后以压轴计算题的形式露露脸.值得注意的是,在实际生活中所用的燃气灶、热水器、发动机等效 First, an overview of proposition intent Throughout the past three years of physical examination questions around the calculation of heat as the focus of junior high school physics, frequently used to test the students to examine the point of this knowledge is often a combination of production and life, modern science and technology and Social hot issues to create a physical scenario, mainly to examine the calorific value calculation formula calorific value formula, the formula for calculating the efficiency of understanding and application.Especially to vigorously promote energy-saving emission reduction, green today, “efficiency ” the word frequency The bigger the problem, the more the “efficiency question” is gradually becoming the new favorite of the physics examinations, and many of them are exposed in the form of finale calculation questions at the end of the test paper.It is worth noting that in actual use, gas stoves, water heaters and engines Equivalent