Source transformation 2

.PS
include(pstricks.m4)

scale=25.4

cct_init

define(`termrad_',`sourcerad_/4')
define(`terminal',`circle rad termrad_')

dy=20
dx=25

O: (0,0)

move to O

Va: source(up_ 2*dy,V,);llabel(,v_a,);rlabel(,10\;\text{V},)
{ 
  dot(at Here)
  R1: resistor(right_ dx);llabel(,R_1,);rlabel(,10\;\text{k}\Omega,)
  dot(at Here)
}
line up dy
R2: resistor(right_ to (R1.end.x,Here.y));llabel(,R_2,);rlabel(,10\;\text{k}\Omega,)
line down to R1.end
{ 
  dot(at Here)
  R3: resistor(down_ to 1/2 between Here and (Here.x,O.y));rlabel(,R_3,);llabel(,5\;\text{k}\Omega,)
  R4: resistor(down_ to (Here.x,O.y));rlabel(,R_4,);llabel(,5\;\text{k}\Omega,)
  dot(at Here)
}
line right dx
{ 
  dot(at Here)
  Ib: source(down_ to (Here.x,O.y),I,,R);rlabel(,i_b,);llabel(,1\;\text{mA},)
  dot(at Here)
}
line right dx/2
Ta: terminal
line right from O to (Ta.w.x,O.y)
Tb: terminal

"$_a$" at Ta.n above
"$_b$" at Tb.s below

.PE