Electrotenia

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ELECTROTÉCNIA
KIRCHOFF
=208·230−[−140·(140)]= 28240
I1=[(0·230)−(−140·10)]/28240= 49 mA
I2=[(280·10)−(−140·0)]/28240= 73 mA
I2=Ir3
Vr3= Ir3·R3 73·68= 4'9V
THEVENIN
Vth= (E1−E2)·[R2/(R1+R2)]+E2
(10−10)·[140/(140+68)]+10= 10V
Rth= R1·R2/R1+R2
140·68/140+68= 45'79
Rth'=R3·R4/R3+R4
68·22/68+22= 16'62
I1= Vth/(Rth− Rth') 10/(45'79−16'62)= 34 mA
I2= Vth/(Rth+R3+R4) 10/(45'79+68+22)= 79 mA
I2=Ir3
Vr3= Ir3·R3 73·68= 4'9V
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R1
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