更多"[单选题]已知i1=10sin(314t+900),i2=10sin("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
B.Style="font-size:20px;">Class="textarea">Data-cke-editable="1"
Contenteditable="false">Nclass="fraction错误n-leaf"
Mathquill-command-id="4">Class="numerator"mathquill-block-id="5">Mathquill-command-id="8">2Mathquill-command-id="9">0Class="de错误minator"
Mathquill-block-id="6">Mathquill-command-id="10">Style="transform:scale(1,0.9);"class="scaled
Sqrt-prefix">√Sqrt-stem"mathquill-block-id="11">Mathquill-command-id="13">2N>Style="display:inline-block;width:0">Pan>Mathquill-command-id="14">A
C.10A
D.Style="font-size:20px;">Class="textarea">Data-cke-editable="1"
Contenteditable="false">Nclass="fraction错误n-leaf"
Mathquill-command-id="4">Class="numerator"mathquill-block-id="5">Mathquill-command-id="8">1Mathquill-command-id="9">0Class="de错误minator"
Mathquill-block-id="6">Mathquill-command-id="10">Style="transform:scale(1,0.9);"class="scaled
Sqrt-prefix">√Sqrt-stem"mathquill-block-id="11">Mathquill-command-id="13">2N>Style="display:inline-block;width:0">Pan>A
[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"
Mathquill-command-id="4">Class="numerator"mathquill-block-id="5">Mathquill-command-id="8">2Mathquill-command-id="9">0Class="de错误minator"
Mathquill-block-id="6">Mathquill-command-id="10">Style="transform:scale(1,0.886111);"
Class="scaledsqrt-prefix">√Class="错误n-leafsqrt-stem"
Mathquill-block-id="11">Mathquill-command-id="13">2N>Style="display:inline-block;width:0">Pan>Mathquill-command-id="14">A
C.10A
D.Style="font-size:20px;">Class="textarea">Data-cke-editable="1"
Contenteditable="false">Nclass="fraction错误n-leaf"
Mathquill-command-id="4">Class="numerator"mathquill-block-id="5">Mathquill-command-id="8">1Mathquill-command-id="9">0Class="de错误minator"
Mathquill-block-id="6">Mathquill-command-id="10">Style="transform:scale(1,0.886111);"
Class="scaledsqrt-prefix">√Class="错误n-leafsqrt-stem"
Mathquill-block-id="11">Mathquill-command-id="13">2N>Style="display:inline-block;width:0">Pan>Mathquill-command-id="14">A
[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]已知，交流电压u1＝10sin100πtV，u2＝10sin(100πt－60°)V。则u＝u1－u2的解析式为
A.u＝10sin(100πt＋60°)V
B.u＝10sin(100πt－60°)V
C.u＝8sin(100πt＋30°)V
D.u＝8sin(100πt－30°)V
[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
[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°
[简答题]已知质点的x和y坐标为x=0.10cos（0.3πt），y=0.10sin（0.3πt），式中x、y以m为单位，t以s为单位。则切向加速度at=。
[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°
[单选题]已知交流电流解析式i1＝60sin(314t＋30°)A，i2＝60sin(314t＋70°)A，i3＝60sin(314t－120°)A。则下列答案中正确是
A.i1比i2滞后60°
B.i1比i2超前60°
C.i1与i2同相
D.i3比i1滞后150°
[单选题]正弦电压u1=10sin(ωt+15o)V 和 u2=10√2sin(2ωt-15o)V 的相位差是( )。
A.30o
B.-30o
C.0o
D.不确定
[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]某元件的电压和电流分别为u＝10sin(1000t＋45°)V，i＝0.1sin(1000t-45°)A，则该元件是纯电感性元件。
A.正确
B.错误
[多选题]已知ψ角范围-30°<ψ<30°，当U10∧I1为( )时判断为感性。
A.140°
B.255°
C.100°
D.10°
