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题目:如图电路中,电源电压保持不变,变阻器的变化范围为0~50欧,小灯泡的额定功率为1.6瓦,忽略灯泡的电阻
Title: In the circuit shown in the figure, the power supply voltage remains the same, the varistor range is 0 to 50 ohms, and the small lamp has a rated power of 1.6 watts, ignoring the lamp’s resistance.