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t = 2h = 120min = 7200 s
P = W/t
P = 18000/7200
P = 2,5 W
t = 2h = 7200s
W= 18 kJ = 18 * 10³ J
P = W/t
P = 2,5 W
ODP: Moc tej żarówki wynosi 2,5 W
P=18000/7200
P=2,5 W