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[tex]t=2 h 15 min=2,25 h\\P=\frac{W}{t}=>W=Pt= 1500*2,25=3375 Wh\\1Wh=0,001 kWh\\W=3375*0,001 kWh=3,375 kWh\\1 kWh= 3600000 J\\W=3,375*3600000 J=12150000 J[/tex]