//chapter 18
//example 18.3
//page 765
printf("\n")
printf("given")
I4=1*10^-3;Vb2=9.8;
disp(" for Vo=11V moving contact at top of R5")
Vo=11;
R3=(Vo-Vb2)/I4
R=Vb2/I4//R=R4+R5
disp(" for Vo=13V moving contact at bottom of R5")
Vo=13;
I4=Vo/(R3+R)
R4=Vb2/I4
R5=R-R4