\(R_{tđ}=\dfrac{R_1.R_2}{R_1+R_2}=\dfrac{80.100}{80+100}=\dfrac{400}{9}\left(\Omega\right)\)
\(U=U_1=U_2=120V\)
\(\left\{{}\begin{matrix}I=\dfrac{U}{R_{tđ}}=\dfrac{120}{\dfrac{400}{9}}=2,7\left(A\right)\\I_1=\dfrac{U_1}{R_1}=\dfrac{120}{80}=1,5\left(A\right)\\I_2=\dfrac{U_2}{R_2}=\dfrac{120}{100}=1,2\left(A\right)\end{matrix}\right.\)
\(\left\{{}\begin{matrix}P_1=U_1.I_1=120.1,5=180\left(W\right)\\A_2=P_2.t=U_2.I_2.t=120.1,2.15.60=129600\left(J\right)\end{matrix}\right.\)
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