Cực trị của dòng điện xoay chiều

2

RL

2CR

1 1

L 2LC

 

 

2

2

2CR

1 1

L

R C

 

2

2CR

1 1

L 2

 

b 2a

  

2

b 4ac 1

L

    

2L

L

 



2

CR L



2

RL

x

LC

 

RC



2

2 2

2 RC

1 xLC

 



RL RC (LC)2 RL RC LC R

R L (     2 LC) 0

2

CR 2x(x 1)

2

CR

L

C L

L        

2

L

. 1  1 2x(x 1)

LC(  R C      ) 2 0

2

CR L

L

(**)

)

R R R R

.  1   1 2x(x 1)

2

RL

x

LC

RC

1 xLC

 

2

RL

R

x



2 RC R

1 x



2 1 R

2 2 R

2x(x 1) x(x 1) x(x 1)    

2x(x 1) x (x   1) x (x 1)

2 RL R

x



2

R

2 1 R

2 2 R

2x(x 1)        1       1

2

2x(x 1) 2x  2x

2

2x 2x 2 x

2

1 x 2



2

1 2

2

RL

R

x



2

R

2

1

R

2 2 R

2

RC

R

1 x



2 R RC

x   

 

2 R

2 R

2 R 1

2 R 2



U

1 x





2

CR 2x(x 1)

L

 

C

RC

RCmax

và

Z 1



U

1 x



    

. 1  1 2x(x 1)

    

. 1  1 2x(x 1)