Question

Ma poate ajuta cineva cu primele 5?

Answer 1

1.

t=2 min=120 s

I=200 mA=0,2 A

q=It=120*0,2=24 C

2.

R~ρ

σ=1/ρ

R~l=>R~1/S

R=ρl/S

ρ=ρ₀(1+αt)

3.

1/Rp=∑1/R=>1/Rp=1/R+1/R+1/R+1/R=4/R=>Rp=R/4=100/4=25 Ω

4.

[U]_SI=V

[R]_SI=Ω

VΩ⁻¹=V/Ω=A

5.

P=U²/R=>R=U²/P=220²/40=48400/40=1210 Ω