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滑动变阻器的内容是初中物理学的一个重点,与生活联系比较密切。在电学的许多部分都用到滑动变阻器,如欧姆定律的研究、伏安法测电阻及测定小灯泡电功率等实验。它也是中考中的一个热点,每年中考必考的知识点。具体的考点有:工作原理、对电路的影响、使用方法、改装电表等。很多常规考题都是围绕这些考点进行考查的。滑动变阻器“滑来滑去”看起来变化无常,仔细分析之后我们发现
Slide rheostat content is a middle school physics, with life closer. In many parts of the electrical are used sliding rheostat, such as Ohm’s law of the study, voltammetry resistance measurement and small bulb electric power experiment. It is also a hot spot in the senior high school entrance examination every year in the knowledge of the exam point. Specific test sites are: working principle, the impact on the circuit, the use of methods, such as modified meters. A lot of regular exam questions are examined around these test centers. Slide rheostat “slippery to slide” looks fickle, after careful analysis we found