某同学在做调节灯泡亮度的电学实验时，电路如图所示，电源电压恒为4．5V，电压表量程0～3V，滑动变阻器规格20Ω 1A，灯泡L标有2．5V 1．25W字样（忽略灯丝电阻变化），在不损坏电路元件的情况下

题干

某同学在做调节灯泡亮度的电学实验时，电路如图所示，电源电压恒为4．5V，电压表量程0～3V，滑动变阻器规格20Ω 1A，灯泡L标有2．5V 1．25W字样（忽略灯丝电阻变化），在不损坏电路元件的情况下，下列判断正确的是（）

A：电路中电流变化的范围是0．18A～0．5A

B：滑动变阻器阻值变化的范围是2．5Ω～10Ω

C：灯泡的最小功率是0．162W

D：该电路的最大功率是2．25W

上一题下一题 0.0难度选择题更新时间:2019-05-08 10:47:51

D

阅读下列短文, 从每题所给的四个选项(A、B、C、D)中选出最佳选项。

Film Reviews(影评)
James	I really enjoyed this movie．It's a fun movie for the whole family．I had really good laughs and enjoyed being there
Sam	I would recommend this movie to everyone．In fact, when you go to see it together with your family or friends, I think this movie has something you will really enjoy!
John	I have seen some movies of this kind, but this one is the best．It is so well made．Some of the scenes are so beautiful．
Mary	I went to see this movie with my nine-year-old daughter this Tuesday．I really didn't know too much about it before．My daughter and I were surprised at how funny it was．Just couldn't help laughing．I would recommend this movie to the whole family .

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