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4 第九章电功和电功率本章共五节,依次是《电功和电功率》,《电功率的测量与计算》、《实验:测定小灯泡的电功率》,《电功的计算与测量》和《焦耳定律》。教材的结构与原来的统编课本有很大不同,原统编课本先讲电功,根据电压单位伏特的规定得出计算电功的公式W=UIt,然后讲电功率,并由电功的公式推出电功率公式P=UI;这之后又反过
Chapter 9 Electrical Power and Electrical Power This chapter consists of five sections, which are “Electrical Power and Electrical Power”, “Measurement and Calculation of Electrical Power”, “Experiment: Measurement of Electrical Power of Small Light Bulb”, “Calculation and Measurement of Electrical Power” and “ Joule’s Law. The structure of the textbooks is very different from the original textbooks. The original textbooks first talked about electric power. According to the voltage unit volts, the equation for calculating electric power was calculated as W=UIt, and then the electric power was given and the electric power formula was used. Launched electric power formula P=UI; this was later reversed