Odpowiedzi

2010-03-04T15:34:48+01:00
Witam
dane: U=220V, P=250W, t=5min=300s
szukane: W, J
W = P*t = 250W*300s = 75000 Ws = 75 kJ

P = U*J
J = P/U = 250W/220V = 1,14 A

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