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t=1/3h=20min=1200s
Pu=W/t=600000J/1200s=500W=0,5kW
η=Pu*100%/P=0,5kW*100%/2kW=25%
Wwlozona=2kWx1/3h=0,66MJ
Wuzyteczna=0,6MJ
sprawnosc=Wuzyteczna/Wwlozona
sprawnosc=0,9