[单选题]已知il=30sin(100t+15°),i2=40sin(100t+105°),则i1+i2的初相位是()。A . 90°B . -90°C . 68.1°D . 31.9°
[单选题]已知i1=30Sin(100πt十I5°),i2=40Sin(100πt十105°),则i1+i2的初相位是()。A . 90°B . 9°C . 68.l°D . 31.9°
[单选题]在RC串联电路中,已知外加电压:u(t)=20+90sin(ωt)+30sin(3ωt+50°)+10sin(5ωt+10°)V电路中电流:i(t)=
[单选题]已知:i=100•sin(ωt+30°)A,t=0时,i等于()A。A .-100;B .86.6;C .-50;D .50。
[单选题]u=-100sin(6πt+10°)V超前i=5cos(6πt-15°)A的相位差是()A .25°B .95°C .115°
[单选题]已知:i=100•sin( t+30°)A,t=0时,i等于()A。A .-100B .86.6C .-50D .50
[单选题]若i1=10sin(314t+90°),i2=10sin(314t-90°),i3=10sin314t,其单位是A,当它们通过同一电阻,且通电时间相等时,发热量最大的是()。A . i1B . i2C . i3D . 三者相等
[单选题]u=-100sin(6πt+10°)V超前i=5cos(6πt-15°)A的相位差是()A.25°B.95°C.115°
[单选题]u=-100sin(6πt+10°)V超前i=5cos(6πt-15°)A的相位差是()A.25°B.95°C.115°
[单选题]u=-100sin(6πt+10°)V超前i=5cos(6πt-15°)A的相位差是()A.25°B.95°C.115°