论文部分内容阅读
如图1所示,触头P由a端滑向b端的过程中,理想电流表的示数如何变化? 【分析】设触头P滑至虚线位置时,P左侧部分的电阻为R_2。则电流表的示数为
As shown in Fig. 1, when the contact P slides from the a-end to the b-end, how does the ideal current meter change? [Analysis] When the contact P slips to the dotted line, the resistance of the left part of P is R_2. The current meter is shown as