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题目:(重庆中考)在一次测定小灯泡额定功率的实验中,老师给了下列器材:额定电压为Uo的小灯泡,电源(电压未知),一个阻值为R的电阻,一个滑动变阻器,一个单刀双掷开关和若干导线.实验室不能忽略灯丝的电阻随温度而发生的变化.小张同学设计的实验电路如图1所示.
Title: (Chongqing test) In a small bulb rated power experiment, the teacher gave the following equipment: a small bulb rated voltage Uo, the power supply (voltage unknown), a resistance R resistance, a sliding rheostat, a SPDT switch and a number of wires. Laboratory can not ignore the filament resistance changes with temperature changes. Zhang students experimental circuit design shown in Figure 1.