Odpowiedź :
[tex]Dane:\\U = 9 \ V\\W = 27 \ J\\Szukane:\\q = ?\\\\Rozwiazanie\\\\W = U\cdot I\cdot t\\\\ale \ \ q = I\cdot t\\\\W = U\cdot q \ \ /:U\\\\q = \frac{W}{U}\\\\q = \frac{27 \ J}{9 \ V} = \frac{27 \ V\cdot C}{9 \ V}\\\\\boxed{q = 3 \ C}[/tex]