更多"[单选题]已知i1=10sin (314t-90°)A,i2=10si"的相关试题:
[单选题]已知i1=10sin(314t+900),i2=10sin(628t+300),则():
A.i1超前i2600
B.i1滞后i2600
C.i2超前i13000
D.相位差无法判断
[单选题]已知i1=10sin (314t-90°)A,i2=10sin(628t-30°)A,则( )。
A.i1比i2超前60°
B.i1比i2滞后60°
C.i1比i2超前90°
D.不能判断相位差
[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
B.Style="font-size:20px;">Class="textarea">Data-cke-editable="1"
Contenteditable="false">Nclass="fraction错误n-leaf"
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C.10A
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[单选题]已知一个正弦量为 u1=10sin(314t-90°)A, u2=10sin(628t-30°),则( )。
A.u1 比 u2 超前 60°
B.u1 比 u2 滞后 60°
C.u1 比 u2 超前 90°
D.不能判断相位差
[单选题]如图所示电路中,流经三个电阻的电流分别为I1、I2和I3。若已知R1、R2和R3,则I1 /I3=( )
A.R3/(R1+R2)
B.R3/(R1+R2)R2
C.(R3+R2)/(R1+R2)
D.R3/R1
[判断题]（）已知：i2=2√2SIN（314t+60°），i1=√2SIN（314t-30°）,i2超前i190°
A.正确
B.错误
[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
[多选题]已知并联电路i1=8√2sin(wt+45°)A.i2=6√2sin(wt+135°)A 。则下列表述正确的是(___)。
A.总电流i=20√2sin(wt+98.1°)A
B.总电流i=10√2sin(wt+81.9°)A
C.总电流相量I=10∠81.9°A
D.总电流相量I=20∠98.1°
[多选题]已知i=10sin(100π+150°)A.则i的三要素是(___)。
A.I=10A
B.Im=10A
C.w=100πrad/s
D.φ=150°
[填空题] 已知电流互感器的额定二次电流I2N = 1（A），电流互感器的额定容量S2N是0.2VA，求通过二次额定负载阻抗为（ ）。
[判断题]设某节点有三个支路，I1>0，I2<0，I3>0，该节点电流方程为I3-I2=I1。
A.正确
B.错误
[单选题]某元件的电压、电流（关联方向）分别为：u＝10sin(ωt−45˚)V，i＝2sin (ωt+45˚)A，则该元件是（____）。
A.电容元件
B.电阻元件
C.电感元件
D.无法确定
