[单选题]已知正弦交流电流i＝10sin(314t＋25°)则其频率为( )。
A.50Hz
B.220Hz
C.314Hz
D.100Hz

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[单选题]已知正弦交流电流i=10T2sin(314t+25°)则其频率为( )。
A.50HZ
B.220HZ
C.314HZ
D.100πHZ

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[单选题]正弦交流电电流 I=10Sin(314t-30°)A,其电流的最大值为( )A。
A.7.7
B.10
C.14
D.20

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[单选题]正弦交流电流i=10sin(100πt+30°)A，则电流有效值为(____)。
A.10A
B.14.14A
C.7.07
D.7.07A

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[单选题]正弦交流电流i=10sin(100πt+30°)A，则电流最大值为(____)。
A.10
B.14.14A
C.7.07A
D.10A

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[单选题]正弦交流电流i=10sin(100πt+30°)A，则初相角为(____)。
A.0°
B.30°
C.60°
D.90°

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[单选题]
若电流i=i1+i2，且i1=10sinωtA，
I2=10sinωtA，则i的有效值为（）。
A.20A

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C.10A

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[单选题]
若电流i=i1+i2，且
I1=10sinωtA,i2=10sinωtA,则i的有效值为
（）。
A.20A

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C.10A

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[单选题]已知正弦交流电压u=220sin(314t-30°)则其角频率为( )。
A.30
B.220
C.50
D.100π

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[单选题]已知正弦交流电流i=100πsin(100πt+φ)则电流的有效值为( )。
A.70.7
B.100
C.70.7π
D.100π

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[单选题]
正弦电流i(t)=【10sinωt+20cos（ωt+30°）】
A的有效值为（）。
A.30A

B.21.21A

C.12.25A

D.15.81A

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[单选题] 周期为0.2sV正弦交流电,其频率为()Hz。
A.50
B.5
C.500
D.2

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[判断题]一个正弦交流电的周期是0.02秒;则其频率为角频率ω为314rad/s。
A.正确
B.错误

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[判断题].某一正弦交流电的周期为0.01ｓ，则其频率为100HZ。( )
A.正确
B.错误