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t = 3 min = 3 /60 h = = 0,05 h
E = W = P * t
W = 1,8 kW * 0,05 h = 0,09 kWh
koszt:
1 kWh = 0,6 zł
0,09 kWh = x zł
x = 0,09 * 0,6 = 0,054 zł