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一、伏安法测电阻的两种常规接法“伏安法”测电阻实验的原理是欧姆定律或欧姆定律的变形公式.其常规测量及常见实验变形如下:图1图2上述图1称为电流表外接法,图2称为电流表内接法.由于电流表和电压表本身也有电阻,当电路中接入了电流表和电压表之后,不可避免地改变了电路本身,这就给测量结果带来了误差.当然,由于初中阶段一般不考虑电表的内阻问题,我们也就不需要考虑实验误差问题,所以,初中阶段我们认为两种接法都可以.例1(2013年上海)小陆做“用电流表、电压表测电阻”实验,现有电源(电压为6 V且保持不变)、待
First, the voltammetric method to measure the resistance of two conventional connection “Voltammetry ” The principle of resistance measurement experiment is Ohm’s law or Ohm’s law of the deformation formula of its conventional measurement and common experimental deformation is as follows: Figure 1 Figure 2 The above figure 1 is called the ammeter external connection, called the ammeter connection method in Figure 2. Since the ammeter and voltmeter itself also has resistance, when the circuit is connected ammeter and voltmeter, the inevitable change in the circuit itself, which gives the measurement results Of course, because the junior high school generally do not consider the internal resistance of the meter, we also do not need to consider the experimental error, so junior high school we can think of either way. Lu made “use ammeter, voltmeter resistance ” experiment, the existing power supply (voltage of 6 V and remains unchanged), to be