a) Prima data grupam R1 si R2 in serie:
Res=R1+R2
Res=12Ω
Acum grupam in paralel Res cu R3:
[tex]\frac{1}{Rep}=\frac{1}{Res}+\frac{1}{R3}[/tex]
[tex]\frac{1}{Rep}=\frac{1}{12}+\frac{1}{6}[/tex]
[tex]\frac{1}{Rep}=\frac{3}{12}[/tex]
Rep=4Ω
b)[tex]I2=\frac{U_{Res} }{Res}[/tex]⇒[tex]U_{Res}=I2Res[/tex]⇒[tex]U_{Res}[/tex]=8,4V
[tex]U_{Res}=U_{R3}=U_{Rep}[/tex]=8,4Ω
I3=[tex]\frac{U_{R3} }{R3}[/tex]⇒[tex]I3=\frac{8,4}{6}[/tex]⇒I3=1,4A
