题目

小华做测量灯泡电功率的实验，所用小灯泡额定电压为2.5V． （1）如图甲所示，用笔画线代替导线，将实验电路连接完整． （2）当电压表的读数为    V时，小灯泡达到额定功率，此时电流表的示数如图乙所示，其值为    A，小灯泡的额定功率为    W． （3）实验时闭合开关，两表均有示数，然后将灯泡从灯座中取走，电流表    （有/没有）示数，电压表    （有/没有）示数．The policeman said the accident was __________ careless driving. Therefore, the driver had to pay for all the losses. A. due to B. thanks toC. led to D. owe to