“练习使用万用电表测量电阻”是高中物理实验中的一个重要实验。根据现行教材要求,学生在掌握了万用电表的欧姆挡使用方法之后,由学生自己动手测量电阻,其中测量一个额定电压220伏,功率60瓦的电灯泡的电阻。教材在课后布置了这样—道思考题:“把你测量的灯泡的电阻和根据额定电压、额定功率计算出来的电阻的大小比较一下,说明这两个阻值为什么不一致?” “Practicing the use of multimeter to measure resistance” is an important experiment in high school physics experiments. According to the current textbook requirements, after the student has mastered the use of the ohmmeter of the multimeter, the student himself measures the resistance and measures the resistance of a light bulb with a rated voltage of 220 volts and a power of 60 watts. The textbooks are arranged after class like this - thinking questions: “Comparison of the resistance of the light bulb you measured with the size of the resistance calculated from the rated voltage and rated power, indicating why the two resistances are inconsistent?”