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在一般情况下,小灯泡的实际功率会随电压或电流的变化(使温度发生变化)而变化,如何确定将小灯泡接入电路后灯泡上的电压、电流,就成为解决灯泡功率问题的关键所在。例1 小灯泡灯丝的电阻会随温度的升高而增大,某同学为研究这一现象,利用下列实验器材:电压表、电流表、滑动变阻器(变化范围0～10Ω)、电源、小灯泡、开关、导线若干来设计实验,并通过实验得到如下数据(I 和 U 分别表示小灯泡上的电流和电压)。
Under normal circumstances, the actual power of a small light bulb changes with voltage or current (changes in temperature). How to determine the voltage and current on a light bulb after the light bulb is connected to a circuit is the key to solving the problem of lamp power. Where Example 1 The resistance of the filament of a small light bulb will increase as the temperature rises. To study this phenomenon, a classmate uses the following experimental equipment: voltmeter, ammeter, sliding rheostat (variable range from 0 to 10Ω), power supply, light bulb, Several experiments were conducted using switches and wires, and the following data were obtained through experiments (I and U indicate current and voltage on a small bulb, respectively).