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判断两个物理量的大小是中考和竞赛中的常考内容,这类题的通用思维方法有:(1)需要判断物理量的可能数值(利用提供的数值中的中间数值求差);(2)比较两物理量的大小(利用需要比较的物理量表达式求差);(3)判断用电器能否正常工作(利用电流、电压或功率的实际数值与额定值求差来判断).
Judging the size of two physical quantities is the most common test content in the senior high school entrance examination and competition. Common thinking methods of such questions are as follows: (1) the possible numerical values of the physical quantity need to be judged (using the median numerical difference provided); (2) Compare the two physical quantities (use the physical quantities that need to be compared for difference); (3) Determine whether the electrical appliances can work normally (use the difference between the actual value of the current, voltage or power and the rated difference to judge).