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能量转化效率题是近几年来中考物理的又一亮点,其目的主要是考察学生知识迁移能力,利用所学的机械效率的知识去分析解决其他有关效率的问题,难度较大.解答此类试题的关键是要明确效率的含义,分析出哪些能量是有用的能量,哪些是总能量,然后利用公式求解.在中考中,此类试题会把电学和力学、电学和热学、热学和力学等联系起来,综合性强.图1例1如图1表示白炽电灯将电能转化为光能和内能的大致比例,由此可以计
The question of energy conversion efficiency is another bright spot in the physics of examination in recent years, its purpose is to examine the students knowledge transfer ability, the use of knowledge of mechanical efficiency to learn to solve other problems related to efficiency, more difficult. The key is to clarify the meaning of efficiency, analysis of what energy is useful energy, which is the total energy, and then use the formula to solve.In the test, such questions will be electrical and mechanical, electrical and thermal, thermal and mechanical contact Up, comprehensive strong Figure 1 Example 1 Figure 1 shows the incandescent lamp will be converted into electrical energy into light energy and the approximate proportion of internal energy, which can count