Realiza la simulación del circuito.
It= IR1+ IR2+ IR3.
R12= R1+R2/ R1+R2
= 1000-330/1000+130= 250 (ohms)
Rt= R12·R3/R12+R3
= 250·120/250+120
= 30000/370= 80 (ohms)
It= Vt/Rt = 9V/1K= 9mA
IR1=VR1/R1= 9V/330(omhs)= 27mA
IR2=VR2/R2= 9V/330(omhs)= 27mA
IR3= VR3/R3=9V/120(omhs)=75mA
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