I :
I = I1 + I2 + I3,
I1 = E/r1 = Eg1, g1=1/r1, g-,
I2 = E/r2 = Eg2,
I3 = E/r3 = Eg3,
I = E(g1 + g2 + g3) = Eg, g = g1 + g2 + g3,
R=1/g, I = E/r,
EI = I12 r1+I22 r2+I32 r3.
, , .
.
. . :
1. ( ) n;
2. m;
3. (m-1) ;
4. ( II ) n-(m-1).
5. , II ;
6. . +, .
7. .
n=6, m=4
1). A: I1 + I2 + I6 = 0
2). B: I5 - I1 - I3 = 0
3). : I4 + I3 - I2 = 0
4). I: 1 - 2 - 3 = I1 (r1 + r6) - I2r2 - I3r3
5). II: E2 + E4 = I2r2 + I6r7 + I4r4
6). III: E3 + E5 - E4 = I5 (r5 + r8) + I3r3 - I4r4
2. , , ,
3. (. ) , ( ): R 1 = 2 ; R 2 = 1 ; R 3 = 4 ; R 4 = 3 ; R 5 = 5 ; EG 1 = 10 ; RG 1 = 1 . I .
1. , . 1.29, = 78 , r0 = 0,5 . R1 = 10 , R2 = 5 , R3 = 4 . .
1
1. .
R3 , I , R1 R2 I1 I2. .
2. :
R = r0 + R3 + R1 R2 / (R1 + R2) = 0,5 + 4 + 5 * 10 / (5 +10) = 7,8
3. :
I = E / R = 78 / 7,8 = 10 .
4. :
U12 = R12 I = 3,3 * 10 = 33 ; U3 = R3 I = 4 * 10 = 40 ;
U = E - r0 I = 78 - 0,5 * 10 = 73 .
5. :
I1 = U12 / R1 = 33 / 10 = 3,3 ; I2 = U12 / R2 = 33 / 5 = 6,6 ;
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P1 = R1 I12 = U12 I1 = 108,9 ; P2 = R2 I22 = U12 I2 = 217,8 ;
P3 = R3 I2 = U3 I = 400 .
DP = r0 I2 = 50 .
P = E I = 780 .
4. (. ) , : R 1 = 2 ; R 2 = 1 ; R 3 = 1 ; R 4 = 2 ; EG 1 = EG 2 = 10 ; RG 1 = RG 2 = 1 . .