Question

Rezolvati problema urgent

Answer 1

Se da:
U=120V
R1=10ohm
R2=20ohm
R3=30ohm
r=2ohm
t=20min=1200s
I=?A
Isc=?A
P=?W
Q=?J
n=?%

Formule:
I=U/R
I=U/(R1+R2+R3)

Isc=E/r
E=I(R+r)
E=I(R1+R2+R3+r)
Isc=I(R+r)/r

P=UI

Q=Pt

n=[R/(R+r)]*100%
n=[(R1+R2+R3)/(R1+R2+R3+r)]*100%

Calcule:
I=120/(10+20+30)=2A
E=I(10+20+30+2)=124V
P=120*2=240W
Q=240*1200=288000J
n=[(10+20+30)/(10+20+30+2)]*100%=96,77%