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V=1l
1l wody ma mase 1kg
m=1kg
t= 0,5 min = 30 s
T= 20'C
cw=4200J/kg*C
W=?
W=E=Q
Q=cw*m*T
Q=4200*1kg*20'C = 84000J
P=W/t
P=Q/t
P=8400J : 30s = 2800W
Moc grzalki: 2800W:)