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V = 110 Volt
m = 1 liter air = 1 kg
t = 80 s
ΔT = 5 C
1 J = 0,24 Kalori
Ditanyakan : R ?
Dijawab :
Q = mx c x ΔT
= 1 x 4.200 x 5
= 21000 J
W = V²/R x t
21.000 = 110²/R x 80
21.000 = 12.100/R x 80
21.000R = 968.000
R = 968.000/21.000
R = 46,1 ohm