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W = P * t
P = 2,1 kW = 2100W
t = 12min = 720s
W = 2100 * 720 = 2820 [J] = 2,82 kJ
więc
W = P * t
P = 2,1 kW = 2100 W
t = 12 minut = 720 sekund
W = 2100 * 720 = 1512000 J czyli 1512 kJ