Verified answer

b)

I1=I2=I0

U1=R1*I1=2*2=4B

U2+U1+I*r=E

U2=E-U1-I*r=16-4-2*1=10B

R2=U2/I2=10/2=5Ом

d)

R12=2*6/(2+6)=1,5Ом

U1=U2=R12*I0=1,5*4=6B

I1=U1/R1=6/2=3A

I2=I0-I1=4-3=1A

E=U1+r*I0=6+4*1=10B

f)

U1=U2

R1=U1/I1=18/0,5=36Ом

E=U1+r*I0

I0=(E-U1)/r=(20-18)/1=2A

I2=I0-I1=2-0,5=1,5A

R2=U2/I2=18/1,5=12 Ом