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初中物理第二册第九章电功率一节里,有这样一段话;“如果用电器两端的电压不等于它的额定电压,它的实际功率也就不等于它的额定功率。”怎样计算非额定条件下用电器的实际功率呢?现以白炽电灯为例来说明这个问题。课本在“测定小灯泡的功率”的实验里,已经介绍了灯泡略高于额定电压和低于额定电压并测得实际工作电流时实际功率的计算方法。但是一般题目常常只给出实际工作电压,要计算出实际功率,这就要设法知道实际工作时的电阻,
In the section on electric power in Chapter 9 of Junior Physics Physics Book 2, there is such a paragraph; “If the voltage across the appliance is not equal to its rated voltage, its actual power is not equal to its rated power.” How to calculate non-rated Under the conditions of the actual power of the use of electrical appliances? Now with incandescent lamps as an example to illustrate this problem. In the textbook “Determining the power of small bulbs”, the textbook has described the calculation method of the actual power when the bulb is slightly higher than the rated voltage and lower than the rated voltage and the actual operating current is measured. However, general problems often only give the actual working voltage. To calculate the actual power, it is necessary to find out the resistance during actual operation.