DANE:
m = 1 l = 1 kg
c = 4200 J / kg * oC
T = 100 oC - 20 o C = 80 oC
W = ?
P = 2 kW
t = ?
W = mcT = 1 kg * 4200 J / kg*oC * 80 oC = 256 000 J
t = W/P = 256 000 J / 2000 W = 128 s
Odp. Czas wynosi 128 s, czyli około 2 min.
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DANE:
m = 1 l = 1 kg
c = 4200 J / kg * oC
T = 100 oC - 20 o C = 80 oC
W = ?
P = 2 kW
t = ?
W = mcT = 1 kg * 4200 J / kg*oC * 80 oC = 256 000 J
t = W/P = 256 000 J / 2000 W = 128 s
Odp. Czas wynosi 128 s, czyli około 2 min.