: R1= 10 . R2.=20 R3 = 3 . U=120 . . () . R1, R2, , .
:
() , :
R= R1 + R2 + R3=10+20+30 = 60 .
I = U / R = 120/60= 2 .
, R1:
U1 = I R1 = 210 = 20 .
, R2 :
P2 = I2 R2 = 2220 =80 .
, ( ):
= 1 + 2 + = U I = 120 2 = 240 .
2.2 .
r = 100 . . . , .
R 150 .
.
3 . . , , .. .
150 , R "" .
, ""
U = U - U =150 - 3 = 147 .
, , ,
I = U / R = 3/100 = 0,03 .
, . , :
R= U/I = 147 / 0,03 = 4900 .
3
, , : R1= 10 , R2= 4 , R3 = 8 , , R2 20 .
, U1 U3 U.
: 5; R1 R3 50 40; 110.
4*
, , R, 50 R. R . .
|
|
( , ) U1 = 240 . ( , ) U2 80 .
R. , .
: Rp =100 ; 160.