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我们知道,用电压表测量用电器两端的电压,要将电压表与所测用电器并联,这样电压表的读数就等于该用电器两端的电压,以此类推,当用电压表测量滑动变阻器两端的电压时,要将电压表与滑动变阻器接入电路中的有效阻值并联,如果滑动变阻器接入电路中是遵循“一上一下”的原则,那么与滑动变阻器相并联的电压表也要遵循“一上一下”的原则,与上面原则不一致的应当是错误的,笔者在教学中一直是这样讲解的。在2012年秋学期高二
We know that the use of voltmeter measuring the voltage across the appliance, the voltmeter and the measured electrical parallel, so voltmeter reading is equal to the voltage across the appliance, and so on, when using a voltmeter to measure the sliding rheostat two When the terminal voltage, the voltmeter and slide rheostat access circuit connected in parallel with the effective resistance, if the sliding rheostat access circuit is to follow the principle of “one last”, then the parallel with the sliding rheostat voltage meter is also To follow the “one on one” principle, inconsistent with the above principles should be wrong, I have been in teaching this way to explain. In the fall of 2012, sophomore year