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P = 11 kW
t = 7 h
Rozw.:
E = W = P × t = 11 kW × 7 h = 77 kWh
77 kWh × 40 gr/kWh = 3080 gr = 30,80 zł
77*0,4zł=30,8zł
W=11kW*7 h = 77 kWh
77 kWh × 40 gr/kWh = 3080 gr = 30,80 zł