题目内容
(请给出正确答案)
[单选题]
已知某个负载的电压u=50sin(314t£60°)V,电流i=5sin(314t£«30°)A,电压u和电流i参考方向一致,则这是一个()。
A.感性负载
B.容性负载
C.纯电感负载
D.纯电容负载
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A.感性负载
B.容性负载
C.纯电感负载
D.纯电容负载
A."当负载电流I=常数时,U=f(I)"
B."当励磁回路的电阻为常数时,U=f(I)"
C."当励磁回路的电阻为常数时,即U=f(If)"
D.当发电机增电压U不变时,I=f(If)
A.300W
B.260W
C.500W
D.600W
A.I = U/R,P = U^2/R
B. I = U×R,P =U/R
C. I = R/U,P =U×R
D. I = U×R,P =U^2×R
A.P=√3U线I线cosφ
B.P=√3U线I线
C.P=√3U线I线cosφ/2
D.P=U线I线cosφ
A.R = U/I,P = U×I
B. R = I / U,P = U^2/I
C. R = U×I,P = U/ I^2
D. R = U^2/I,P = U^2×I
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
A.U = I×R,P = I^2×R
B. U = I / R,P = I^2/R
C. U = R / I,P = R / I^2
D. U = I + R,P =I ×R