300 * 3 = 900sek
900s = 15min
15min = 0,25h
E = P * t
E = 400W * 0,25h = 100Wh
odp.Wiertarka pobierze 100Wh energii
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300 * 3 = 900sek
900s = 15min
15min = 0,25h
E = P * t
E = 400W * 0,25h = 100Wh
odp.Wiertarka pobierze 100Wh energii