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串联电路功率分配跟电阻成正比.如图1,R_1上消耗的功率P_1=I~2R,R_2上消耗的功率为P_2=I~2R_2,这一结论学生很容易接受,用实验直观地反映这个事实的方法也有多种.最简单的是《高中物理第二册(必修)教学参考书》上第66页介绍的方法,用“220V,100W”和“220V,25W”的灯泡各一只串联后接到照明电路中,通过比较两灯的亮度;或用手感觉两灯的温度高低,来
The power distribution of the series circuit is proportional to the resistance. As shown in Figure 1, the power consumed on R_1 is P_1=I~2R, and the power consumed on R_2 is P_2=I~2R_2. This conclusion is very easy for students to accept and intuitively reflect this with experiments. There are also a variety of facts. The simplest method is the method described on page 66 of the “High School Physics Book 2 (Required) Teaching Reference Book”. Use one of the “220V, 100W” and “220V, 25W” bulbs in series. After receiving the lighting circuit, compare the brightness of the two lamps; or feel the temperature of the two lamps by hand,