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有些试题,为了较深入地考查学生分析、解决问题的能力,有意将电路的连接情况巧妙地隐含于题意之中。如何将这一隐含条件分析、判定出来呢?本文结合数例加以说明。 一、题目中未给出电路图,且电路的具体连接情况不明确 例1 连接在同一电路中的两个电阻,通过它们的电流强度之比I_1:I_2=1:2,这时它们的电功率之比P_1:P_2=_。 分析:解此题可抓住已知的电流之比进行分析。假如这两电阻是串联,由于串联电路各处
Some questions, in order to examine the students’ ability to analyze and solve problems in more depth, intentionally implicitly link the circuit’s connection to the questions. How to analyze and determine this hidden condition? This article describes several examples. I. The circuit diagram is not given in the title, and the specific connection of the circuit is not clear. Example 1 Two resistors connected in the same circuit, through the ratio of their current strength I_1:I_2=1:2, at this time their electrical power. Than P_1:P_2=_. Analysis: This problem can be solved by analyzing the ratio of known currents. If the two resistors are in series, due to the