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“伏安法”测小灯泡电阻和电功率是初中物理的两个重要电学实验,它集中了初中电学的几乎所有重点知识。一、实验中的常见故障分析1.电压表示数为电源电压,电流表无示数。原因:电压表串联在电路中(可能是小灯泡的灯丝断了)。2.无论怎样移动滑片,电压表示数为电源电压;电流表的示数较大,电流表、电压表的示数均不变,小灯泡较亮,且亮度不变。原因:滑动变阻器接的是上面两个接线柱,即滑动变阻器接入电路中的电阻为0。
“Voltammetry ” Measuring small bulb resistance and electric power is two important electrical experiments in junior high school physics, it focused almost all the key knowledge of junior high school electrical. First, the analysis of common failures in the experiment 1. The voltage is expressed as the number of power supply voltage, ammeter no indication. Cause: The voltmeter in series in the circuit (probably a small bulb filament is broken). 2. No matter how to move the vane, the voltage indicates the number of the power supply voltage; the ammeter shows a larger number, ammeter, voltmeter shows the same number, a small light bulb, and the same brightness. The reason: the sliding rheostat is connected to the above two terminals, sliding rheostat access circuit resistance of 0.