1) I=U/R=120/400=0,3 A 2) R=p*L/S S=p*L/R=12*10^8*5*10^3/60=10^-3 м2 3) R=R1*R2/(R1+R2)=7,5*30/(7,5+30)=6 Ом U=I*R=7,5*6=45 И I1=U/R1=45/7,5=6 A I2=I-I1=7,7-6=1,5 A
4) R23=R2*R3/(R2+R3)=3*6/(3+6)=2 Ом Ucd=R*I=6*2=12 B
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1) I=U/R=120/400=0,3 A 2) R=p*L/S S=p*L/R=12*10^8*5*10^3/60=10^-3 м2 3) R=R1*R2/(R1+R2)=7,5*30/(7,5+30)=6 Ом U=I*R=7,5*6=45 И I1=U/R1=45/7,5=6 A I2=I-I1=7,7-6=1,5 A
4) R23=R2*R3/(R2+R3)=3*6/(3+6)=2 Ом Ucd=R*I=6*2=12 B