Ic = Vcc - Vc/Rc
Ic = 18V - 12V/4,7K
Ic= 1,27mA
Ve = Re . Ie
Ve = 1,2K . 1,27mA Ie = Ic .: 1,27mA
Ve = 1,52V
Vb = Ve + Vbe
Vb = 1,52V + 0,7V
Vb = 2,22V
R1 = 18V . 5,6K - 2,22V . 5,6K/2,22V
R1 = 39,8K
VTh = 5,6K/(R1 + 5,6K) . Vcc
VTh = 5,6K/(39,8K + 5,6K) . 18V
VTh = 2,22V
