统编高中物理下册第二章练习六第5题,其题意是:如附图所示,滑动触头D从A移向C时,电流表都有电流通过,但电流强度逐渐减小,这时可能在什么地方发生了断路?如果电流表指示的电流强度逐渐增大,又可能是什么地方发生了断路? 这道习题不仅是理论联系实际的好题,而且也是对电桥“平衡电路”“理解能力”的培养。 “物理教学”1982年第5期,曾经有严格的数学解答,这样做当然不能说是错误的,但是这样教给学生只是复习串并联及欧姆定律,它脱离了电桥电路,又放过了培养“物理上理解”的分析能力,其结果,同学到了实验室,要立即判断出故障所在还是不能解决,因为要进行一定运算才能得出结论。我认为此题应该这样教不仅能避免上述缺 The second problem in the second chapter of the sixth chapter of the Physics Book of Senior High School is the sixth question in the sixth chapter of the Physics of Senior High School. The idea is: as shown in the drawing, when the sliding contact D moves from A to C, the current flows through the ammeter, but the current intensity gradually decreases. At this time, where might an open circuit occur? If the current intensity indicated by the ammeter increases gradually, what may be the place where an open circuit occurs? This exercise is not only a good theory that links theory to practice, but also the bridge “balance circuit” “”Understand ability’s cultivation. “Physics teaching ” 1982 issue No. 5, once had a strict mathematical solution, of course, this can not be said to be wrong, but to teach students to just review the series and parallel and Ohm’s law, it is out of the bridge circuit, and put After cultivating the ability to “physically understand” the analysis, the result was that when the students arrived at the laboratory, it was necessary to immediately determine where the fault was or could not be solved, because it was necessary to perform certain operations before reaching a conclusion. I think this question should be taught not only to avoid the above deficiency