一个小灯泡的额定电压为2.0V．额定电流约为0.5A，选用下列实验器材进行实验，并利用实验数据描绘和研究小灯泡的伏安特性曲线

A．电源E：电动势为3.0V，内阻不计；

B．电压表V₁：量程为0～3V，内阻约为1kΩ

C．电压表V₂：量程为0～15V，内阻约为4kΩ

D．电流表A₁：量程为0～3A，内阻约为0.1Ω；

E．电流表A₂：量程为0～0.6A，内阻约为0.6Ω；

F．滑动变阻器R₁：最大阻值为l0Ω，额定电流为0.6A；

G．滑动变阻器R₂：最大阻值为l5Ω，额定电流为1.0A；

H．滑动变阻器R₃：最大阻值为l50Ω，额定电流为1.0A；

I．开关S，导线若干．

实验得到如下数据（I和U分别表示通过小灯泡的电流和加在小灯泡两端的电压）：

Last night I was getting ready for the coming examination while the noise from my neighbor interrupted me. The noise went on and on. It was too loud that I could hardly pay attention with my study any longer. So I went to my neighbor house and said him, “Excuse me, would you please turn down the TV? I’m preparing for tomorrow’s examination.” Hear these words, his face turned to red. And he said, “OK, I will. I’m very sorry have made so much noise. Just now, the football game was very wonderful. I was too exciting to control myself. I won’t do that again. Good luck in your coming examination.” After that, I got down to his study.

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阅读下列图片，回答问题。

材料一

材料二