张家口市坝上地区的风力发电场是北京冬奥会绿色电能的主要供应地之一,其发电、输电简易模型如图所示,已知风轮机叶片转速为每秒
z转,通过转速比为1:
n的升速齿轮箱带动发电机线圈高速转动,发电机线圈面积为
S , 匝数为
N , 匀强磁场的磁感应强度为
B ,
t=0时刻,线圈所在平面与磁场方向垂直,发电机产生的交变电流经过理想变压器升压后,输出电压为
U , 电流为
I , 忽略发电机线圈电阻。下列说法正确的是( )
![](http://tikupic.21cnjy.com/2023/09/05/c4/3b/c43b436dd0ce9d4b856767b6d3a5b9ab_526x174.png)
- A、t=0时刻,发电机线圈产生的感应电动势最大
- B、发电机产生
瞬时电动势![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmi%3Ee%3C%2Fmi%3E%3Cmo%3E%3D%3C%2Fmo%3E%3Cmsqrt%3E%3Cmrow%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsqrt%3E%3Cmtext%3E%CF%80%3C%2Fmtext%3E%3Cmi%3EN%3C%2Fmi%3E%3Cmi%3EB%3C%2Fmi%3E%3Cmi%3ES%3C%2Fmi%3E%3Cmi%3En%3C%2Fmi%3E%3Cmi%3Ez%3C%2Fmi%3E%3Cmtext%3Es%3C%2Fmtext%3E%3Cmtext%3Ei%3C%2Fmtext%3E%3Cmtext%3En%3C%2Fmtext%3E%3Cmrow%3E%3Cmo%3E%28%3C%2Fmo%3E%3Cmrow%3E%3Cmn%3E2%3C%2Fmn%3E%3Cmtext%3E%CF%80%3C%2Fmtext%3E%3Cmi%3En%3C%2Fmi%3E%3Cmi%3Ez%3C%2Fmi%3E%3Cmi%3Et%3C%2Fmi%3E%3C%2Fmrow%3E%3Cmo%3E%29%3C%2Fmo%3E%3C%2Fmrow%3E%3C%2Fmath%3E)
- C、变压器原、副线圈的匝数比为
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmsqrt%3E%3Cmrow%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsqrt%3E%3Cmtext%3E%CF%80%3C%2Fmtext%3E%3Cmi%3EN%3C%2Fmi%3E%3Cmi%3EB%3C%2Fmi%3E%3Cmi%3ES%3C%2Fmi%3E%3Cmi%3En%3C%2Fmi%3E%3Cmi%3Ez%3C%2Fmi%3E%3Cmn%3E%EF%BC%9A%3C%2Fmn%3E%3Cmi%3EU%3C%2Fmi%3E%3C%2Fmath%3E)
- D、发电机线圈中的电流为
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmfrac%3E%3Cmrow%3E%3Cmsqrt%3E%3Cmrow%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsqrt%3E%3Cmtext%3E%CF%80%3C%2Fmtext%3E%3Cmi%3EN%3C%2Fmi%3E%3Cmi%3EB%3C%2Fmi%3E%3Cmi%3ES%3C%2Fmi%3E%3Cmi%3En%3C%2Fmi%3E%3Cmi%3Ez%3C%2Fmi%3E%3Cmi%3EI%3C%2Fmi%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmi%3EU%3C%2Fmi%3E%3C%2Fmrow%3E%3C%2Fmfrac%3E%3C%2Fmath%3E)