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t=8s
P=W/t
P=320/8
P=40
t=8s
P=?
W=P*t
P=W/t=320J/8s=40W
W = 320J (praca)
t = 8s (czas)
P = W/t = 320J/8s = 40W (1Wat = 1J : 1s)
Odp. Moc urządzenia 40 Wat.