U1=U2=Uобщ=120 B I1=U1/R1=120/3000=40 мА I2=U2/R2=120/2000=60 мА R345 = R3+R4+R5=6 кОм I3=I4=I5=I345 = U345/R345 = 120/6000=20 мА U3=I3*R3=0,020*1000=20 B U4=I4*R4=0,020*3000=60 B U5=I5*R5=0,020*2000=40 B I общ = I1+I2+I345=0,040+0,060+0,020=0,120 А = 120 ма R общ = U общ/ I общ = 120/0,120 = 1000 Ом = 1 кОм
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IUV
или 1/R общ = 1/R1 + 1/R2+1/R345 = 1/2000+1/3000+1/6000
IUV
R общ = 1/(1/R1 + 1/R2+1/R345) =1/( 1/2000+1/3000+1/6000)=1000 Ом
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Verified answer
U1=U2=Uобщ=120 BI1=U1/R1=120/3000=40 мА
I2=U2/R2=120/2000=60 мА
R345 = R3+R4+R5=6 кОм
I3=I4=I5=I345 = U345/R345 = 120/6000=20 мА
U3=I3*R3=0,020*1000=20 B
U4=I4*R4=0,020*3000=60 B
U5=I5*R5=0,020*2000=40 B
I общ = I1+I2+I345=0,040+0,060+0,020=0,120 А = 120 ма
R общ = U общ/ I общ = 120/0,120 = 1000 Ом = 1 кОм