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题目:如图所示,电源电压为4.5伏且保持不变,小灯泡L标有“PZ2.5~1.25”字样,滑动变阻器R的最大电阻值是40欧,电压表只有0~3伏的量程。求:小灯泡在此电路的最小功率。
Title: As shown in the figure, the power supply voltage is 4.5 volts and remains the same. The small bulb L is marked with the words “PZ2.5 to 1.25”. The maximum resistance of the sliding rheostat R is 40 ohms, and the voltmeter is only 0 to 3 Volt range. Seeking: The minimum power of a small light bulb in this circuit.