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估算是在解决实际问题时,抓住主要因素,忽略次要因素,运用相关的知识和规律对问题进行综合判断和分析.电学实验是高考的热点,因为电学实验的实验原理及电路设计可以考查学生对知识的迁移能力和创新能力,电学仪表及滑动变阻器的供电电路选择可以考查学生综合分析问题的能力,实物图的连接可考查学生的动手能力.在设计电学实验中,涉及电表的选择、滑动变阻器连接方式的确定等,一般都需要经估算加以确定.下面仅就2004年普通高等学校招生全国统
The estimation is to solve the actual problems, seize the main factors, ignore the minor factors, use the relevant knowledge and laws to comprehensively judge and analyze the problems. The electrical experiment is a hot spot of the college entrance examination because the experimental principle and circuit design of the electrical experiment can be examined. Students’ ability to transfer knowledge and innovation, electrical instrumentation and the selection of power supply circuits for sliding rheostats can examine the student’s ability to analyze problems comprehensively. The connection of physical maps can examine students’ hands-on abilities. In designing electrical experiments, the choice of meter is involved. The determination of the sliding rheostat connection method, etc., generally needs to be determined by estimation. The following is only the national colleges and universities recruited in 2004.