[tex]Dane:\\W = 5\cdot10^{5} \ J\\t = 0,01 \ h = 0,01\cdot3600 \ s = 36 \ s\\R = 0,5\cdot10^{4} \ \Omega =5\cdot10^{3} \ \Omega\\Szukane:\\U = ?\\\\Rozwiazanie\\\\W = U\cdot I\cdot t\\\\ale\\\\I = \frac{U}{R}\\\\W = \frac{U^{2}\cdot t}{R} \ \ |\cdot\frac{R}{t}\\\\U^{2} = W\cdot\frac{R}{t}\\\\U = \sqrt{W\cdot\frac{R}{t}}\\\\U = \sqrt{5\cdot10^{5}\cdot\frac{5\cdot10^{3}}{36}}}\\\\U = \sqrt{\frac{25}{36}\cdot10^{8}}\\\\U = \frac{5}{6}\cdot10^{4} \ V=0,8(3)\cdot10^{4} \ V\\\\U \approx8 \ 333 \ V[/tex]
