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Dane:
U = 220 V
P = 250 W
t = 5 min = 300 s
Rozw.:
praca prądu elektrycznego
W = P×t = 250 W × 300 s = 75000 J = 75 kJ
b)
P = U × I
z tego
I = P/U = 250 W / 220 V = 1, 136 A ≈ 1,14 A