更多"[单选题]正弦电流i(t)=【10sinωt+20cos(ωt+30°"的相关试题:
[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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[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]正弦电流i的表达式为(___)A
A.i=Imcos(wt+φ)
B.i=Imsin(wt+φ)
C.i=Imsin(φt+w)
D.i=Imcos(φt+w)
[多选题]若电阻元件R=10欧姆,通入正弦电流i=5√2sin(100πt+30°)A ,3min内电阻消耗的能量表述正确的是(____)。
A.I=5√2A
B.Im=5√2A
C.W=32000J
D.W=45000J
[单选题]某工频正弦电流,当t=0,i(0)=5A为最大值,则该电流解析式是()
A.i=5√2sin(100∏t-90°)
B.i=5√2sin(100πt+90°)
C.i=5sin(100∏t+90°)
D.i=5sin(100∏t)
[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
[单选题]已知一正弦交流电流i=30sin(314t+30°)A。则它的频率f=(___)Hz
A.314
B.30
C.50
D.80
[单选题]已知一正弦交流电流i=30sin(314t+30°)A,则初相角θ为(____)。
A.0°
B.30°
C.60°
D.90°
[单选题]两个正弦交流电流i1、i2的最大值都是4A,相加后电流的最大值也是4A,它们之间的相位差为
A.30°
B.60°
C.120°
D.90°
[判断题]正弦电流或正弦电压是交流电的一种特殊情形。 ( )
A.正确
B.错误
[单选题]纯电感元件在正弦交流电路中,流过的正弦电流( )。
A.与电压同相位
B.超前电压90°相位角
C.滞后电压90°相位角
D.滞后电压30°相位角
[多选题]对同一正弦电流而言,( )。
A.电压
B.电流
C.频率
D.电容量
[判断题]正弦电流激励下,磁通为尖顶波。( )
A.正确
B.错误
[简答题]LZE30117 已知某正弦交流电流,当t=0时的瞬时值i(0)=0.5A,并知其初相角Ψ=30°,试求其有效值I。
[单选题] 已知i=311sin(314t+600)A,则该正弦交流电流的有效值是()A。:
A.311
B.314
C.220
D.60
[单选题]已知i=311sin(314t+600)A,则该正弦交流电流的最大值是()A。:
A.311
B.314
C.220
D.60