题目内容
(请给出正确答案)
[单选题]
已知某正弦交流电的频率为50Hz,有效值相量为U=20∠30°V,则其瞬时表达式为()
A.u=20sin(50t+30°)V
B.u=20sin(314t+30°)V
C.u=28.28sin(50t+30°)V
D.u=28.28sin(314t+30°)V
答案
D、u=28.28sin(314t+30°)V
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A.u=20sin(50t+30°)V
B.u=20sin(314t+30°)V
C.u=28.28sin(50t+30°)V
D.u=28.28sin(314t+30°)V
D、u=28.28sin(314t+30°)V
A.i=10√2Sin(50t+30°)A
B.i=10Sin(314t-30°)A
C.i=10√2Sin(314t-30°)A
D.i=10Sin(314t+30°)A