Circuit paral·lel

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

R1xR2/R1+R2
RT= 1000x330/1000+330
RT= 330000/1330=248,120
248,12x120/248,12+120=29,7799
29,7799/368,12= 80,8

Ir1= V/R1  9/1000= 0,009=9
Ir2= V/R2  9/330= 0,0027=27
Ir3= V/R3 9/120= 0,075=75