Circuit Paral·lel

R1=1ohms
R2=330ohms
R3=120ohms
Vcc=9V

RT= R1 X R2/R1 + R2
1000 X 330/ 1000 + 330 

330000/1330=248,120 ohms

248,12 X 120/248,12 + 120 = 29774,4/368,12= 80,88 ohms
IT=VT/RT 9/80,88
IT=0,11127 Am IT=111,27mA
IR1=/V/R1  9/1000=0,009=9
IR2=/V /R2 9/330=330=27     = 112
IR3= /V/R3 9/120=120=75