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有一道中考题: 有一电阻,当它两端的电压从2V增加到4V,通过它的电流增大了1 A。求:在此过程中该电阻的电功率变化了多少? 分析这道题考查了学生对电功率公式的理解程度以及对用电器的电功率大小受何因素影响的掌握程度。但大多数学生都这样做的:
There is a test question: There is a resistor, when the voltage across it increases from 2V to 4V, the current through it increases by 1A. What is the change in the electrical power of the resistor during this process? The analysis of this question examines how well the students understand the electrical power formula and how well the electrical power of the appliance is affected. But most students do this: