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P=n*Pż=10*100W=1000W=1kW
W=U*I*t
U*I=P stąd W=P*t
W=1kW*6h=6kWh
K=k*W=0,27(zł/kWh)*6kWh=1,62zł
1kWh = 27gr
1 żarówka = 100W
czas : 6h
100W*10=1000W=1kW
1kW*6h=6kWh
6kWh*0,27zł=1,62zł
10*0,1*6=6 kWh
6*0,27 = 1,62 zł