Question

O baterie cu tensiune electromotoare de 9V, are tensiunea la borne de 8 V cand debiteaza un curent de 2A.
a. Determinati valoarea rezistentei circuituluinexterior
b. Ce energie electrica consuma in 10 minute
c.determinati valoarea rezistentri interioare

Answer 1

[tex]Se~da:\\ \\ E=9V\\ \\ U=8V\\ \\ I=2A\\ \\ a)R=?\Omega\\ \\ b)t=10min=600s;L=?J\\ \\ c)r=?\Omega\\ \\ \\[/tex]


[tex]Formule:\\ \\ a)I=\frac UR\Rightarrow R=\frac UI\\ \\ \\ b)L=U\times I\times t\\ \\ \\ c)U=E-I\times r\\ \\ I\times r=E-U\\ \\ r=\frac{E-U}I\\ \\ \\ Calcule:\\ \\ a)R=\frac 82=4\Omega\\ \\ b)L=8\times 2\times 600=9600J\\ \\ c)r=\frac{9-8}2=0,5\Omega\\ \\ [/tex]