题干

图甲所示是小明的调光灯电路图,他将粗细均匀的电阻丝AB通过滑片P连入电路,小灯泡的额定电压为6V。闭合开关S后,滑片P从最左端A滑到最右端B的过程中,小灯泡的I—U关系图像如图乙所示。(电阻丝AB的阻值不随温度变化),下面说法中正确的是(   )

A:电阻丝AB的阻值为6Ω

B:小灯泡的最小功率为1.5W

C:电路中的最大功率是6W

D:滑片P从最左端A滑到最右端B的过程中,电压表示数变大

上一题 下一题 0.0难度 选择题 更新时间:2013-05-10 03:39:20

答案(点此获取答案解析)

C

同类题4

阅读短文,从每题所给的四个选项(A、B、C 和 D)中选出最佳选项。

B

Welcome to English First, a teaching experience you will never forget!

    We're looking for amazing English teachers to join us in Beijing, Shanghai, Shenzhen, Guangzhou, and many other cities across China to teach adults, children or at our online     schools. You will get a good pay.

About English First(EF)

    English First is the world's best education company. Set up in 1965, EF runs in over 50 countries around the world. We still need teachers for teaching jobs across China, so if you  like modern city life, we probably have what you want. We  have both Teens  schools and Adult schools in over 60 cities in China.

Teaching at English First

    At English First, we'll offer you the best teaching ways to help you become the best teacher. Our new and colorful classrooms provide you with great teaching tools, including computers and iPads. We also offer the best teacher development program for our teachers.

Join the EF Teacher Network Today

    We're here to provide what we need for every step of the way, from preparing your work visa to the airport pickup service. Learn how to order food in Chinese during our free language classes. There're many new experiences of living abroad "waiting" for you to have here. And you'll experience them to the fullest at EF.

What you should be (what you need)for the job

★A native English speaker.

★Having a four-year learning experience at university.

★The Teaching English as a Foreign Language(TEFL)paper.

★A passport holder from the western country.

★The ability to live abroad for at least one year.