问题 选择题

图乙是小型交流发电机的示意图,在匀强磁场中,一矩形金属线圈绕与磁感线垂直的转轴匀速转动,产生的电动势随时间变化的正弦规律图像如图甲所示。发电机线圈内阻为10Ω,外接一只电阻为90Ω的灯泡,不计电路的其他电阻,则

A.灯泡两端的电压为198V

B.每秒钟内电流方向改变50次

C.灯泡实际消耗的功率为537.8W

D.发电机线圈内阻每秒钟产生的焦耳热为48.4J

答案

AD

题目分析:观察甲图可知电源为正弦交流电,最大值周期为0.02s,那么1秒钟有50个周期,每个周期电流方向改变2次,共计100次,答案B错。有效电压为,电路电流,灯泡两端电压答案A对。灯泡功率,答案C错。发电机线圈内阻每秒钟产生的焦耳热答案D对。

阅读理解

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小题1:The purpose of the advertisements is________.

A.to start a business

B.to employ English teachers

C.to provide the latest jobs

D.to help people find a suitable job小题2:According to the first advertisement, we can learn that_______.

A.English Teacher agency charges teacher for this service

B.you must go online to offer your basic information first

C.you may call to get more information about the job

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D.you can only speak English小题5:The underlines word “CALLING” in the fourth advertisement most means_________.

A.job or profession

B.wish

C.interest

D.chance

单项选择题