Question

va rog am nevoie de ea pana maine!!!

Answer 1

Răspuns:

Explicație:

Hristos a inviat!

Problema 1

Date

E=4,5 V

r = 0,5Ω

U = 4 V

Cerinte

I, R, P=?

a) I=U/R=4/0,5=8A

b) I=E/(R+r)⇒I(R+r)=E⇒

IR+Ir=E⇒R=(E-Ir)/I⇒

R=(4,5-4×8)/8⇒

R=0,5/8Ω

c) P=U×I=4×8=32w

Problema 2

Date

R=2Ω

E=6V

r=1Ω

Cerinte

I, U, u=?

W=?, t=3 min=3×60=180 s

Pt=?

a) I=E/(R+r)=6/(2+1)=2A

b) U=I×R=2×2=4V

c) u = I×r=2×1=2V

d) W=U×I×t=4×8×180=5760J

e) Pt= E×I=E²/(R+r)=6²/3=12w