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【简答题】
在测定“小灯泡电功率”的实验中，小灯泡额定电压为2.5V。图甲是某同学没有连接完的实物电路。 甲 乙 丙 （1）请你用笔画线代替导线，帮他将实物电路连接完整； （2）小叶同学闭合开关，移动滑片P到某一点时，电压表示数（如图乙所示）为 V，若他想测量小灯泡的额定功率，图甲中滑片P向 ____ （选填“A”或“B”）端移动，使电压表的示数为2.5V。 （3）小叶同学通过移动滑片P,记下了多组对应的电压表和电流表的读数,并绘制成了图丙所示的U－I图像。根据图像信息，可计算出小灯泡的额定功率是 W。 （4）在另一组同学连接的电路中，闭合 开关，移动滑动变阻器滑片P的过 发现，灯泡变亮时，电压表示 数反而减小，灯泡变暗时，电压表 示数反而增大。经检查所用器材均 完好。你认为图与上述实验现象相符的电路图是____________。
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