Source transformation 3

.PS
include(pstricks.m4)

scale=25.4

cct_init

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

vsp=20
hsp=25

O: (0,0)

move to O

Va: source(up_ vsp,V,);llabel(,v_a,);rlabel(,10\;\text{V},)
{ 
  dot(at Here)
  R1: resistor(right_ hsp);llabel(,R_1,);rlabel(,1\;\text{k}\Omega,)
  dot(at Here)
}
line up vsp
Ib: source(right_ to (R1.end.x,Here.y),I);llabel(,i_b,);rlabel(,5\;\text{mA},)
line down to R1.end
{ 
  dot(at Here)
  R2: resistor(down_ to (Here.x,O.y));rlabel(,R_2,);llabel(,4\;\text{k}\Omega,)
  dot(at Here)
}
line right hsp/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