Verified answer

а)

I1=I2=I0=2A

U1=R1*I1=3*2=6B

R2=U2/I2=10/2=5Ом

R=R1+R2+r=3+5+1=9Ом

E=R*I=9*2=18B

c)

R12=12*18/(12+18)=7,2Ом

R=0,8+7,2=8 Ом

I0=E/R=16/8=2A

U12=U1=U2=R12*I0=7,2*2=14,4В

I1=U1/R1=14,4/12=1,2А

I2=I0-I1=U2/R2=0,8A

е)

I1=I0-I2=3-2=1A

U1=I1*R1=1*4=4B

U2=U1

R2=U2/I2=4/2=2Ом

E=U1+r*I0=4+1*3=7В