- Mạch điện RLC nối tiếp, lập phương trình u, i -...

A u = 40cos(100πt +π2) V 

B u = 40√2cos(100πt + π/2) V

C u = 40cos(100πt) V 

D u = 40√2cos(100pt + π) V

A i = 10cos(100 π t + 5 π /6) A 

B i = 10 √2 cos(100 π t + π /6) A

C i = 10 √2 cos(100 π t - 5 π /6) A 

D i = 10 √2 cos(100 π t + 5 π /6) A

A u = 20 √2  cos(100 π t + π) V

B u = 20 √2  cos100 π t V

C u = 20 √2  cos(100 π t + π /2) V

D u = 20 √2  cos(100 π t - π /2) V

A i = 2√3cos(100πt - 5π/6) A

B i = 2√3cos(100πt + π/6) A

C i = 2√2cos(100πt + π/6) A

D i = 2√2cos(100πt -π/6) A

A 60 Ω; π/4 rad         

B 60√2 Ω; π/4 rad          

C 60√2 Ω; - π/4 rad        

D 60 Ω; - π/4 rad

A 50F 

B 50.10^-3 F 

C 10^-3 /5π  F               

D Không đáp án

A  40 Ω 

B 60 Ω 

C  50 Ω 

D  100 Ω 

A 300 Ω 

B 400 Ω 

C 500 Ω 

D 600W

A Z = 30Ω;R =10Ω;L = 0,2H 

B Z = 40Ω;R = 20Ω;L = 0,11H

C Z = 50Ω;R =30Ω;L = 0,51H 

D Z = 48Ω;R = 27Ω;L = 0,31H

A -250Ω 

B 250Ω 

C -350Ω 

D 350Ω 

A Z_L = 100 Ω; u = 200cos(100πt - π/2) V 

B Z_L= 100 Ω; u = 200cos(100πt + π2) V

C Z_L = 100 Ω; u = 200cos(100πt) V 

D Z_L= 200 Ω; u = 200cos(100πt + π/2) V

A i = 25cos(100 π t + π /2) A 

B i = 2,5cos(100π t + π /6) A

C i = 2,5 cos(100 π t + 5 π /6) A 

D i = 0,25 cos(100 π t + 5 π /6) A

A \(i = 2,4\cos \left( {100\pi t - \pi } \right)A;{\text{ }}P = 250W\;\)

B \(i = 2,5\cos \left( {100\pi t - \pi } \right)A;{\text{ }}P = 250W\)

C \(i = 2\cos \left( {100\pi t + \pi } \right)A;{\text{ }}P = 250W\;\) 

D \(i = 2,5\cos \left( {100\pi t - \pi } \right)A;{\text{ }}P = 62,5W\;\)

A i = 2cos (100 π t + π /3) (A) 

B i = 2cos (100 π t + π /6) (A)

C i = 2cos (100 π t - π /6) (A) 

D i = 2 cos (100 π t - π /3) (A)

A u = U₀cos(100 π t + π/4) V 

B u = U₀cos(120 π t + π/4) V 

C u = U₀cos(50 π t + π/4) V 

D u=U₀cos(60 π t + π/4 ) V 

A \({{{I_0}} \over \omega }\,\,\left( C \right)\)

B \({{2{I_0}} \over \omega }\,\,\left( C \right)\)

C \({{{I_0}} \over {2\omega }}\,\,\left( C \right)\)

D 0

A  $\frac{\sqrt2 \pi I_0}{ \omega }$

B 0 

C  $\frac{\pi I_0}{\sqrt2 \omega }$

D  $\frac{2I_0}{\omega }$

A -3,25.10^-3 C. 

B 4,03.10^-3 C. 

C 2,53.10^-3 C 

D -4,59.10^-3 C

A i = 4 √2cos(100πt + π/6) A

B i = 5cos(100πt + π/6) A

C i = 4 √2cos(100πt - π/6) A

D i = 5cos(100πt - π/6)A

A 50 Ω 

B 40 Ω 

C 60 Ω 

D 45 Ω 

A -π /4 

B π /4 

C π /6 

D -π /6 

A Z = 60 Ω; Z_C =18 Ω    

B Z = 60 Ω; Z_C =12 Ω     

C Z = 50 Ω; Z= =15 Ω 

D Z = 70 Ω; Z_C =28 Ω

A R = 100 Ω; L = 1/π H 

B R = 100√3 Ω; L = 2/π H 

C R = 100 Ω; L = 2/π H 

D R = 100√3Ω; L = 1/π H

A 70 hoặc 130 Ω 

B 100 Ω

C 60 Ω; 140 Ω             

D không có đáp án.

A 100 Hz 

B 50 Hz 

C 40 Hz 

D 60 Hz 

A 12,5 Ω 

B 12,5√2 Ω 

C 12,5√3 Ω 

D 125√3 Ω

A C = 10^-4/2πF 

B C = 5.10^-3/πF 

C C = 10^-3/5πF 

D Không có đáp án

A R, C

B R, L 

C L, C                         

D Cả 3 đều sai

A 25 Hz 

B 100Hz 

C 300Hz 

D 500Hz

A \(R = \dfrac{{{u_R}}}{i}\)  

B \({Z_L} = \dfrac{{{u_L}}}{i}\)   

C \({Z_C} = \dfrac{{{u_C}}}{i}\)

D Đáp án khác

A 4A

B 5A

C 6A

D 7A

A \(u = 40\cos \left( {100\pi t + \dfrac{\pi }{2}} \right){\rm{ }}V\)  

B \(u = 40\sqrt 2 \cos \left( {100\pi t + \dfrac{\pi }{2}} \right){\rm{ }}V\)

C \(u = 40\cos \left( {100\pi t} \right){\rm{ }}V\)

D \(u = 40\sqrt 2 \cos \left( {100\pi t} \right){\rm{ }}V\)

A \({Z_L} = 100\Omega ;{\rm{ }}u = 200\cos \left( {100\pi t - \dfrac{\pi }{2}} \right)V\)      

B \({Z_L} = 100\Omega ;{\rm{ }}u = 200\cos \left( {100\pi t + \dfrac{\pi }{2}} \right)V\)

C \({Z_L} = 200\Omega ;{\rm{ }}u = 200\cos \left( {100\pi t} \right)V\)  

D \({Z_L} = 200\Omega ;{\rm{ }}u = 200\cos \left( {100\pi t + \dfrac{\pi }{2}} \right)V\)

A \(i = 2,5\cos \left( {100\pi t + \dfrac{\pi }{2}} \right)A\)                  

B \(i = 2,5\cos \left( {100\pi t + \dfrac{\pi }{6}} \right)A\)

C \(i = 2,5\cos \left( {100\pi t + \dfrac{{5\pi }}{6}} \right)A\) 

D \(i = 0,25\cos \left( {100\pi t + \dfrac{{5\pi }}{6}} \right)A\)

A \(i = 2,4\cos \left( {100\pi t - \pi } \right)A;P = 250W\)   

B \(i = 2,5\cos \left( {100\pi t - \pi } \right)A;P = 250W\)

C \(i = 2\cos \left( {100\pi t + \pi } \right)A;P = 250W\) 

D \(i = 2,5\cos \left( {100\pi t - \pi } \right)A;P = 500W\)

A \(i = 10\cos \left( {100\pi t + \dfrac{{5\pi }}{6}} \right)A\)    

B \(i = 10\sqrt 2 \cos \left( {100\pi t + \dfrac{\pi }{6}} \right)A\)

C \(i = 10\sqrt 2 \cos \left( {100\pi t - \dfrac{{5\pi }}{6}} \right)A\) 

D \(i = 10\sqrt 2 \cos \left( {100\pi t + \dfrac{{5\pi }}{6}} \right)A\)

A \(i = 2\cos \left( {100\pi t + \dfrac{\pi }{3}} \right)\left( A \right)\)    

B \(i = 2\cos \left( {100\pi t + \dfrac{\pi }{6}} \right)\left( A \right)\)

C \(i = 2\cos \left( {100\pi t - \dfrac{\pi }{6}} \right)\left( A \right)\)  

D \(i = 2\cos \left( {100\pi t - \dfrac{\pi }{3}} \right)\left( A \right)\)

A \(u = 20\sqrt 2 \cos \left( {100\pi t + \pi } \right)V\)                                   

B \(u = 20\sqrt 2 \cos \left( {100\pi t} \right)V\)

C \(u = 20\sqrt 2 \cos \left( {100\pi t + \dfrac{\pi }{2}} \right)V\)     

D \(u = 20\sqrt 2 \cos \left( {100\pi t - \dfrac{\pi }{2}} \right)V\)

A \(u = {U_0}\cos \left( {100\pi t + \dfrac{\pi }{4}} \right)V\)         

B \(u = {U_0}\cos \left( {120\pi t + \dfrac{\pi }{4}} \right)V\)

C \(u = {U_0}\cos \left( {50\pi t + \dfrac{\pi }{4}} \right)V\)  

D \(u = {U_0}\cos \left( {60\pi t + \dfrac{\pi }{4}} \right)V\)

A \(i = 4\sqrt 2 \cos \left( {100\pi t + \dfrac{\pi }{6}} \right){\rm{ }}A\)    

B \(i = 5\cos \left( {100\pi t + \dfrac{\pi }{6}} \right){\rm{ }}A\)

C \(i = 4\sqrt 2 \cos \left( {100\pi t - \dfrac{\pi }{6}} \right){\rm{ }}A\)

D \(i = 5\cos \left( {100\pi t - \dfrac{\pi }{6}} \right){\rm{ }}A\)

A \(i = 2\sqrt 3 \cos \left( {100\pi t - \dfrac{{5\pi }}{6}} \right)A\)  

B \(i = 2\sqrt 3 \cos \left( {100\pi t + \dfrac{\pi }{6}} \right)A\)

C \(i = 2\sqrt 2 \cos \left( {100\pi t + \dfrac{\pi }{6}} \right)A\) 

D \(i = 2\sqrt 2 \cos \left( {100\pi t - \dfrac{{5\pi }}{6}} \right)A\)

A 4A   

B \({\rm{4}}\sqrt[]{3}{\rm{A }}\)       

C \({\rm{2,5}}\sqrt[]{2}{\rm{A }}\)          

D 5A

A \(i = 2\sqrt 2 \cos \left( {100\pi t - \dfrac{\pi }{4}} \right)\,(A)\) 

B \(i = 2\sqrt 2 \cos \left( {100\pi t + \dfrac{\pi }{2}} \right)\,(A)\) 

C \(i = 2\sqrt 2 \cos \left( {100\pi t + \dfrac{\pi }{4}} \right)\,(A)\)

D \(i = 2\cos \left( {100\pi t - \dfrac{\pi }{2}} \right)\,(A)\)

A \(i = 2\sqrt 3 \cos \left( {100\pi t - \dfrac{\pi }{6}} \right)A\)   

B \(i = 2\sqrt 3 \cos \left( {100\pi t + \dfrac{\pi }{6}} \right)A\)

C \(i = 2\sqrt 2 \cos \left( {100\pi t + \dfrac{\pi }{6}} \right)A\)  

D \(i = 2\sqrt 2 \cos \left( {100\pi t - \dfrac{\pi }{6}} \right)A\)

A 1000W     

B 968W   

C 800W  

D 1936W

A 1A       

B – 1A        

C \( - \sqrt 3 A\) 

D \(\sqrt 3 A\)

A 1A  

B – 1A    

C \( - \sqrt 3 A\)  

D \(\sqrt 3 A\)

A \( - 2,5\sqrt 3 A\) 

B \(2,5\sqrt 3 A\)  

C \(2,5\sqrt 2 A\)  

D \( - 2,5\sqrt 2 A\)