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t=5min=5*60s=300s
W=1000J
P=W/t
P=1000J/300s
P=3⅓W
2.
P=1000W
t=3s
W=Pt
W=1000W*3s
W=1000J/s*3s
W=1000J*s
W=3000J
t = 5min = 5×60s = 300s
W = 1000J
Szukane:
P = ?
Wzór:
P = W/t
P = 1000J : 300s
P ≈ 3,3 W
Odp.: Moc urządzenia wynosi ok.3,3W .
2. Dane:
P = 1000W
t = 3s
Szukane:
W = ?
Wzór:
P = W/t → W = P×t
W = 1000W×3s
W = 1000J/s×3s sekundy się skrócą
W = 3000J = 3kJ
Odp.: To urządzenie wykonuje pracę równą 3kJ .
t = 5 min = 5 x 60 = 300s
W = 1000J
P = W/t
P = 1000J/300s
P=3.3 W
2.
P = W/t / x t
W = P x t
W = 1000W x 3s
W= 3000J