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当电路发生变化时电表怎样变化,学生掌握起来很困难,主要有以下几个原因:1.这类题涉及的知识面很广。如欧姆定律,串联电路的特点,并联电路的特点,滑动变阻器的使用等。2.这类题一般不用定量计算,而只对它作定性分析。3.这类题的正确解决需要学生有较强的识图能力和综合分析能力。4.这类题型变化方式多样,学生难于寻找规律。那么如何解决以上问题呢?
How does the meter change when the circuit changes, and it is very difficult for the students to master it. There are several reasons for this: 1. The knowledge involved in such questions is very broad. Such as Ohm’s law, the characteristics of series circuits, the characteristics of parallel circuits, the use of sliding rheostats and so on. 2. This kind of question generally does not need the quantitative calculation, but only carries on the qualitative analysis to it. 3. The correct resolution of such questions requires students to have a strong ability to map and comprehensive analysis capabilities. 4. This type of question changes in various ways, students find it difficult to find the law. So how to solve the above problem?