Question

rezolvati va rog problema

Answer 1

Se da:
P1=50W
P2=100W
U=100V
t3=10min=600s
U3=100V
R1=?Ohm
R2=?Ohm
I1=?A
I2=?A
L=?J

Formule:
P=U*I
P=U*U/R
R1=U^2/P1
R2=U^2/P2

I1=I2=I
I=U/R
I=U/(R1+R2)

L=U*I*t
L=U*(U/R)*t
1/R=1/R1+1/R2
1/R=(R1+R2)/R1*R2
R=R1*R2/(R1+R2)
L=U^2/[R1*R2/(R1+R2)]*t

Calcule:
R1=100^2/50=200ohm
R2=100^2/100=100ohm

I1=I2=100/(200+100)=0,(3)A

L=100^2/[100*200/(100+200)]*600=90000J