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答案： 0.45 瓦

某同学做“测定小灯泡的功率”实验，电源电压是 1.5 伏的整数倍，滑动变阻器标有“ 5 欧 3 安”字样，所用小灯是额定电压为“ 2.2 伏”，“ 2.5 伏”，“ 3.8 伏”中的一个，估计小灯泡的额定功率在 1.2 瓦左右。该同学正确连接电路，闭合电键后，移动滑动变阻器的滑片，发现滑片在中点附近某位置时，小灯正常发光。此时电流表的示数如图所示。 (1) 小灯泡正常发光时的电流 (2) 小灯的额定电压 (3) 小灯的额定功率。.

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答案： 0.45 瓦

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  1. 某同学做“测定小灯泡的功率”实验，电源电压是1.5伏的整数倍，滑动变阻器标有“5欧 3安”字样，所用小灯是额定电压为“2.2伏”，“2.5伏”，“3.8伏”中的一个，估计小灯泡的额定功率在1.2瓦左右。该同学正确连接电路，闭合电键后，移动滑动变阻器的滑片，发现滑片在中点附近某位置时，小灯正常发光。此时电流表的示数如图所示。 (1)小灯泡正常发光时的电流 (2)小灯的额定电压 (3)小灯的额定功率。

  2. 某同学在做“测定小灯泡功率”实验中,小灯泡标有”0.3安”.滑动变阻器标有”20欧 2安”。按照电路图连接好电路,合上电键,电压表.电流表示数如图。移动滑动变阻器到中点，小灯泡正常工作。求小灯泡的额定功率。 答案：0.45瓦

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