jak długo tzreba ogrzewac 2l wody o temperaturze 20 stopni C grzałką o mocy 800 W aby doprowadzic wode do wrzenia?? Straty ciepła wynosza 25%
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Q = Cw *m * (Tk - Tp)
Q = 4200J/kg*^C*2kg * (100^C - 20^C) = 672kJ = 672Ws
672000 - 75%
x = 100%
100*672000/75 = 896000Ws
W = t*p
t = W/p
t=896000/800 = 1120s = 18,4min