Odpowiedź :
[tex]Dane:\\U = 12 \ V\\I = 6 \ A\\t = 30 \ min = 30\cdot60 \ s = 1 \ 800 \ s\\Szukane:\\W = ?\\\\\\W = U\cdot I\cdot t\\\\W = 12 \ V\cdot6 \ A\cdot1800 \ s=12 \ V \cdot 10800 \ C\\\\\boxed{W = 129 \ 600 \ J = 129,6 \ kJ}[/tex]
[tex]Dane:\\U = 12 \ V\\I = 6 \ A\\t = 30 \ min = 30\cdot60 \ s = 1 \ 800 \ s\\Szukane:\\W = ?\\\\\\W = U\cdot I\cdot t\\\\W = 12 \ V\cdot6 \ A\cdot1800 \ s=12 \ V \cdot 10800 \ C\\\\\boxed{W = 129 \ 600 \ J = 129,6 \ kJ}[/tex]