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某发电机输出交流电的电压瞬时值表达式为u=311sin100πt(V),则以下说法正确的是( ) A.该交流
某发电机输出交流电的电压瞬时值表达式为u=311sin100πt(V),则以下说法正确的是( ) A.该交流
2025-03-16 05:13:17
推荐回答(1个)
回答1:
A、由u=311sin100πt(V)可知,该交流电的最大值为311V,ω=100π,所以T=
2π
ω
=
1
50
=0.02s,频率为50Hz,故AB错误,D正确;
C、根据有效值与最大值的关系可知,有效值U=
U
m
2
=220V
,故C错误.
故选D
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