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P=120wat
t=1min=60sek
W=120*60
W=720J
P=120 W
t=1 min= 60 s.
Szukane:
W=?
P=W/t -------> W=Pt
W=120*60=7200
obliczenia jednostek:
W*s= J/s*s/1=J(sekundy się skracają)
wiec
W=7200 J