1/R(3-5)=1/R3+1/R4+1/R5=1/12+1/18+1/9=1/4 Сим =>
R(3-5)=4/1=4 Ом;
R(2-5)=R2+R(3-5)=36+4=40 Ом;
R(6,7)=R6+R7=40+20=60 Ом;
1/R(2-7)=1/R(2-5)+1/R(6,7)=1/40+1/60=1/24 Сим =>
R(2-7)=24/1=24 Ом;
R(1-7)=R1+R(2-7)=6+24=30 Ом;
R8=R9=40 Ом =>
R(8,9)=R8/2=R9/2=40/2=20 Ом;
R(8-10)=R(8,9)+R10=20+50=70 Ом;
1/R₀=1/R(1-7)+1/R(8-10)=1/30+1/70=1/21 Сим;
R₀=21/1=21 Ом;
I₀=U₀/R₀=252/21=12 A;
U(1-7)=U(8-10)=U=252 B;
I1=U₀/R(1-7)=252/30=8,4 A;
U1=I1*R1=8,4*6=50,4≈50 B;
U(2-5)=U(6,7)=U₀-U1=252-50=202 B;
I2=U(2-5)/R(2-5)=202/40=5,05≈5 A;
U2=I2*R2=5*36=180 B;
U3=U4=U5=U(2-5)-U2=202-180=22 B;
I3=U3/R3=22/12=1,8(3)≈1,8 A;
I4=U4/R4=22/18=1,(2)≈1,2 A;
v1. I5=U5/R5=22/9=2,(4)≈2 A;
v2. I5=I2-I3-I4=5-1,8-1,2=2 A;
I6=I7=I-I2=8,4-5=3,4 A;
U6=I6*R6=3,4*40=136 B;
U7=I7*R7=3,4*20=68 B
v1. I10=U₀/R(8-10)=252/70=3,6 A;
v2. I10=I₀-I1=12-8,4=3,6 A;
U10=I10*R10=3,6*50=180 B;
U8=U9=U₀-U10=252-180=72 B;
I8=I9=U8/R8=U9/R9=72/40=1,8 A;
P₀=U₀*I₀=252*12=3 024 Вт≈3 кВт;
ΣP=P1+P2+P3+P4+P5+P6+P7+P8+P9+P10=
=U1*I1+U2*I2+U3*I3+U4*I4+U5*I5+U6*I6+U7*I7+U8*I8+U9*I9+U10*I10=
=50*8,4+180*5+22*1,8+22*1,2+22*2+136*3,4+68*3,4+72*1,8*2+180*3,6=
=420+900+39,6+26,4+44+462,4+231,2+259,2+648=3 030,8≈3 кВт.
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P.S. Т.к. P₀=3 кВт = ΣP=3 кВт, то баланс мощностей имеет место быть.
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Фсё.
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po=2700 кг/м3 m=5.4 кг
m=po*V V=m/po=5.4/2700=0.002 м куб