Odpowiedź :
[tex]dane:\\P = 600 \ W\\t = 15 \ min = 15\cdot60 \ s = 900 \ s\\szukane:\\E = W = ?\\\\P = \frac{W}{t} \ \ /\cdot t\\\\W = P\cdot t\\\\W = 600 \ W\cdot900 \ s\\\\W = 540 \ 000 \ J = 540 \ kJ[/tex]
[tex]dane:\\P = 600 \ W\\t = 15 \ min = 15\cdot60 \ s = 900 \ s\\szukane:\\E = W = ?\\\\P = \frac{W}{t} \ \ /\cdot t\\\\W = P\cdot t\\\\W = 600 \ W\cdot900 \ s\\\\W = 540 \ 000 \ J = 540 \ kJ[/tex]