[tex]Dane:\\U = 15 \ V\\t = 20 \ min = 20\cdot60 \ s = 1200 \ s\\q = 1 \ Ah = 1 \ A\cdot3600 \ s = 3600 \ C\\Szukane:\\a) \ I = ?\\b) \ E = W = ?\\\\Rozwiazanie\\\\a)\\I = \frac{q}{t}\\\\I = \frac{3600 \ C}{1200 \ s}\\\\\boxed{I = 3 \ A}[/tex]
[tex]b)\\E = W = U\cdot I\cdot t\\\\q = I\cdot t, \ zatem\\\\E = U\cdot q\\\\E = 15 \ V\cdot3600 \ C\\\\\boxed{E = 54 \ 000 \ J = 54 \ kJ}[/tex]
[tex](1 \ kJ = 1000 \ J)[/tex]
