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这是一道以我们日常生活中的“电熨斗”为素材的 STS 试题.此题有助于推动物理学走近生活,走近社会,使学生对物理有亲近感,同时也有利于培养学生分析和解决实际问题的能力.题目(02济南中考题)某种家用电熨斗为适应不同衣料的熨烫,设计了调节温度的旋钮式多档开关。其电路简图如图甲所示。两电阻丝阻值 R_1=R_2=121Ω.旋转多档开关的旋纽可以改变1、2、3、4四个接线点之间的连接情
This is an STS question that is based on the “electric iron” in our daily life. This topic helps to bring physics closer to life, to get closer to society, and to give students a sense of intimacy with physics. It is also conducive to training. Students’ ability to analyze and solve practical problems. Topic (02 Jinan Exam Questions) A type of household electric iron In order to adapt to the ironing of different fabrics, a knob-type multi-position switch for adjusting the temperature was designed. Its circuit diagram is shown in Figure A. Resistance of two resistance wire R_1=R_2=121Ω. The knob of rotary multi-step switch can change the connection between four connection points of 1, 2, 3, and 4