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将电流表改装成电压表是高中物理一个重要实验,由此实验产生了一些问题,激发了学生的探究兴趣。1半偏法测电流表的内阻的误差问题半偏法测电流表的内阻的电路图如图1所示。例1图1中电源电动势为E,其内阻可以忽略,R为滑动变阻器,R′为电阻箱,G为电流表。实验步骤为①闭合S1断开S
Retrofitting an ammeter to a voltmeter is an important experiment in high school physics. This has created some problems and inspired students’ interest in inquiry. 1 The error of the internal resistance of the half-measuring current meter The circuit diagram of the internal resistance of the half-measuring current meter is shown in Fig.1. Example 1 In Figure 1, the power EMF is E, and its internal resistance can be neglected. R is a sliding rheostat, R’ is a resistance box, and G is an ammeter. The experimental procedure is 1 closed S1 disconnect S