电压表和静电计都是用来测量电压大小的两种仪器 ,但由于学生对它们测量电压的原理 ,理解上模棱两可 ,从而导致解题出错率高 ,如下例 :做静电实验时 ,连接如图 (1 )所示电路 ,已知电容图 1器的电容Ｃ1=Ｃ2 ,电源电动势为Ｅ ,内电阻为Ｒ ,电压表的内阻为 1 0ｋΩ ,当电路达到稳 Voltmeters and electrometers are two kinds of instruments used to measure the voltage, but because of students’ principle of measuring voltage, they are ambiguous in understanding, which leads to high error rate of problem solving. The following example: When doing electrostatic experiment, connect the graph as shown in the figure. (1) The circuit shown, known capacitance Figure 1 capacitor C1 = C2, the power EMF is E, the internal resistance is R, the internal resistance of the voltmeter is 10kΩ, when the circuit reaches stability