Răspuns:
a) [tex]\displaystyle{ I_{sc} }[/tex] = 60 amperi
b) U = 2,96 volti
c) u = 0,02 volti
Explicație:
PUNCTUL A
[tex]\displaystyle{ I_{sc} = \frac{E}{r} = \frac{3}{0,05} =60 \ A }[/tex]
PUNCTUL B
S = 2 mm² = [tex]\displaystyle{ 2 \cdot 10^{-6} \ m^{2} }[/tex]
[tex]\displaystyle{ R = \rho \cdot \frac{L}{S} \rightarrow RS = \rho L \rightarrow R = \frac{\rho L}{S} }[/tex]
[tex]\displaystyle{ R = \frac{2,8 \cdot 10^{-8} \cdot 400}{2 \cdot 10^{-6} } = 5,6 \ ohmi }[/tex]
[tex]\displaystyle{ I = \frac{E}{R + r} = \frac{3}{5,6 + 0,05} }[/tex]
[tex]\displaystyle{ I = \frac{3}{5,65} = 0,53 \ A }[/tex]
[tex]\displaystyle{ I = \frac{U}{R} \rightarrow U = I \cdot R = 2,96 \ V}[/tex]
PUNCTUL C
[tex]\displaystyle{ I = \frac{u}{r} \rightarrow u = I \cdot r = 0,53 \cdot 0,05 = 0,02 \ V }[/tex]
