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man hua " tan li shi dian hua " de jiao xue
Author(s): 
Pages: 15-16
Year: Issue:  6
Journal: Experiment and Equipment for Primary School

Abstract: 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.
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