P = 2 I_{1}^{2} \cdot 4 R + \frac{U_{1}^{2}}{8 R} + \frac{U_{2}^{2}}{4 R} = 6, 625 W

${P = 2I_{1}^{2} \cdot 4R + \frac{U_{1}^{2}}{8R} + \frac{U_{2}^{2}}{4R}= 6,625 W}$