oblicz moc żarówki która pobiera 680 kJ energii przez 4h

Dane: W=680kJ=680000J t=4h=4*60min=240min=240*60s=14400s =================================== Szukane: P=? =================================== Wzór: P=W/t P=680000J/14400s P=47,2W Pozdrawiam kari9812