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W= ΔE
W= P * t
W= 1150 * 1200 = 1380000 J = 13,8 MJ
E= 13,8 MJ
P*t= koszt
t= 20min= 1/3 h
koszt= 1150 * 1/3 = 383 Wh = 0,383 kWh
0,383 * 0,4 = 0,34 zł
odp. ten koszt to 34gr, a zuzyta energia wynosi 13,8 MJ