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炭粒式电话的话筒工作原理比较抽象,教学中除用教具模拟外,还尝试用变阻器的电路替代并解释。教材习题设计的插图和教参中的解释与教材知识有诸多矛盾的地方。本文逐一剖析,提出用改变电路结构的方法分析电路中电流的变化,使问题逐个圆满解决。1问题的背景2013年教育部审定的义务教育教科书9年级《物理》全一册(以下简称教科书),是根据国家教育部2011年制定的义务教育阶段《物理课程标准》新修订的教材。书中有这样一段文字:“老式电话的话筒中有一个装着炭粒的小盒子。当你对着话筒讲话时,由于声音的振动,膜片时紧时松
Cellular phone microphone works more abstract, teaching teaching aids in addition to using, but also try to use rheostat circuit to replace and explain. Textbook exercises design illustrations and teaching reference interpretation and textbook knowledge there are many contradictions. This article one by one analysis, proposed to change the circuit structure of the circuit analysis of the current changes, the problem one by one satisfactorily resolved. 1 Background of the Issue The 9th edition of the ”Physical“ Volume 1 (hereinafter referred to as the ”Textbook“) of compulsory education textbooks approved by the Ministry of Education in 2013 is a newly revised textbook according to the ”Physical Curriculum Standards“ set by the Ministry of Education in 2011 in compulsory education. There is a passage in the book: ”Old-fashioned phone has a tiny box of charcoal in it, and when you’re speaking to a microphone,