A.电阻
B.电感
C.电容
D.阻容
[单选题]若电路中某元件两端的电压u=36sin(314t-180)V,电流i=4sin(314t+1800)A,则该元件是()。A .电阻B .电感C .电容D .电抗
[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]若电路中某元件两端的电压u=36sin(314t一1800)v,i=5sin(314t~900)A,则该元件是()。A .电阻B .电感C .电容
[单选题]已知某电路元件的电压u(t)=20sin(314t+30°)V,电流i(t)=5cos(314t+30°)A,这个元件是()。A . 电阻B . 电感C . 电容D . 电压源
[单选题]有两个正弦电压:u1=100sin(314t+120°)V,U2=50sin(314t-90°〕v,则u1与u2的相位差Ψ值和u1.u2的相位关系符合下列选项()A . 210°,超前B . 210°,滞后C . 30°,超前D . 30°,滞后
[单选题]已知电流i(t)=0.1sin(ωt+10°)A,电压u(t)=10sin(ωt-10°)V,则如下表述中正确的是()。A.电流i(t)与电压u(t)
[单选题]已知电流i(t)=0.1sin(ωt+10°)A,电压u(t)=10sin(ωt-10°)V,则如下表述中正确的是()。A.电流i(t)与电压u(t)
[单选题]图示正弦交流电路中,已知u=100sin(10t+45°)(V),i1=i=10sin(10t+45°)(A),i2=20sin(10t+135°)(A),元件1、2、3的等效参数值为:()A . R=5ΩL=0.5H,C=0.02FB . L=0.5H,C=0.02F,R=20ΩC . R1=10Ω,R2=10H,C=5FD . R=10Ω,C=0.02F,L=0.5H
[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]已知某电路元件的电压u(t)=20sin(314t+30°)V,电流i(t)=5cos(314t+30°)A,这个元件是( )。A.电阻B.电感C.