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一、理解能力的考核理解物理概念、规律的确切含义和物理规律的适用条件,以及它们在简单情况下的应用,对同一概念和规律的各种表达形式有清楚地认识,能够鉴别似是而非的说法、认识相关知识的区别和联系.九五年云南省中考有这样一道题:如图1所示的电路中,当滑动变阻器 R’的滑片 P 在 a端时,电流表示数为0.8安培;当滑片 P 滑至 b端时,电流表示数为0.2安,电压表的示数减少了8.4伏特.电源电压不变,求电阻 R 的值.
I. Understanding comprehension of comprehension Comprehend understanding of the physical concept, the exact meaning of the law, and the applicable conditions of the laws of physics, and their application in simple situations. They have a clear understanding of various expressions of the same concept and law and can identify plausible speculations. The understanding of the relevant knowledge of the differences and links. In 1995 the Yunnan Provincial Entrance Examination had this problem: In the circuit shown in Figure 1, when the sliding varistor R’s slide P at the a end, the current representation of the number of 0.8 amps; When the slide P slides to the b-side, the current representation is 0.2 amps, and the voltmeter display is reduced by 8.4 volts. The supply voltage is constant and the value of the resistor R is found.