Question

Cu explicații, va rog mult❤️​

Answer 1

$\displaystyle E=24~V;~r=1~\Omega;~R_1=8~\Omega;~R_2=12~\Omega;~R_3=2,2~\Omega; ~R_4=4~\Omega\\ \\ a.~\frac{1}{R_p} =\frac{1}{R_1} +\frac{1}{R_2} \Rightarrow \frac{1}{R_p} =\frac{R_1+R_2}{R_1R_2} \Rightarrow R_p=\frac{R_1R_2}{R_1+R_2} \Rightarrow R_p=\frac{8\cdot12}{8+12} \Rightarrow \\ \\ \Rightarrow R_p=\frac{96}{20} \Rightarrow R_p=4,8~\Omega\\ \\ R_e=R_p+R_3+R_4\Rightarrow R_e=4,8+2,2+4\Rightarrow R_e=7+4\Rightarrow \mathbf{R_e=11~\Omega}$

$\displaystyle b.~I=\frac{E}{R_e+r} \Rightarrow I=\frac{24}{11+1} \Rightarrow I=\frac{24}{12} \Rightarrow \mathbf{I=2~A}\\ \\ c.~t=10~ s\\ \\ q=It\Rightarrow q=2 \cdot 10\Rightarrow \mathbf{q=20~C}\\ \\ d.~ R_e=R_2+R_3+R_4\Rightarrow R_e=12+2,2+4\Rightarrow R_e=18,2~ \Omega\\ \\ I=\frac{E}{R_e+r} \Rightarrow I=\frac{24}{18,2+1} \Rightarrow I=\frac{24}{19,2} \Rightarrow I=1,25~A\\ \\ U=IR_e\Rightarrow U=1,25\cdot 18,2\Rightarrow \mathbf{U=22,75~V}$