Question

As vrea raționamentul la problema asta ,va rog...

Answer 1

Se da:
E=24V
r=1ohm
R1=8ohm
P1=32W
a)U1=?V
b)I1=?A
c)R2=?ohm
d)t=10min=600s; Q=?J
Formule:
a)P1=U1²/R1
U1²=R1*P1
U1=√(R1*P1)
U1=√(8*32)=16V

b)I1=U1/R1
I1=16/8=2A

c)I1=I2=I

I=E/(R+r)
R+r=E/I1
R=(E/I1)-r
R1+R2=(E/I1)-r
R2=(E/I1)-r-R1
R2=(24/2)-1-8=3ohm

d)Q=I²*R*t
Q=I1²*(R1+R2)*t
Q=2²*(3+8)*600=28800J