\(R_{23}=\dfrac{R_2\cdot R_3}{R_2+R_3}=\dfrac{24\cdot8}{24+8}=6\Omega\)
\(R_{tđ}=R_1+R_{23}=12+6=18\Omega\)
\(I_1=I_m=\dfrac{\xi}{R_{tđ}+r}=\dfrac{12}{18+4}=\dfrac{6}{11}A\)
\(U_2=U_{23}=I_{23}\cdot R_{23}=\dfrac{6}{11}\cdot6=\dfrac{36}{11}V\)
\(P_2=\dfrac{U^2_2}{R_2}=\dfrac{\left(\dfrac{36}{11}\right)^2}{24}=0,45W\)
\(A=P\cdot t=\xi\cdot I\cdot t=12\cdot\dfrac{6}{11}\cdot10\cdot60=3927,27J\)
\(H=\dfrac{R_{tđ}}{r+R_{tđ}}=\dfrac{18}{4+18}=81,82\%\)
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