P=UI
U=Ę
I=120/120=1А
U=IRo
P=I^2*Ro
Ro=R1+R2+R3
I1=I2=I3
R1+R2+R3=P/l^2
R2=P/l^2-R1-R3=120-30-20=70 Ом.
P=UI
U=Ę
I=120/120=1А
U=IRo
P=I^2*Ro
Ro=R1+R2+R3
I1=I2=I3
R1+R2+R3=P/l^2
R2=P/l^2-R1-R3=120-30-20=70 Ом.