Question

Cele 4 probleme, va rog

Answer 1

1. U*I=P

[P]=W

W=J/s

1->b)

2->c)

3.Re=R/4(R/4+R/4+R/4)/(R/4+R/4+R/4+R/4)=R/4*3R/4/4R/4=3R/16

3->a)

4.t=1 min=60 s

Es=nE=10*12=120 V

rs=nr=10*1=10 Ω

I=Es/(R+rs)=120/(10+10)=120/20=6 A

U=RI=10*6=60 V

W=UIt=60*6*60=21600 J

4->d)