Task id9651

Task id9651

An electric stove has a resistance of R = 50 Ohm and is powered by a network whose voltage is U = 220 V. The efficiency of the stove is η = 0.8. How long should ice of mass m = 2 kg, taken at a temperature T1 = 263 K, be heated on this slab in order to turn it into water, and bring the resulting water to a boil and turn it into steam? Specific heat of ice c1 = 2.1 • 103 J/(kg • K), specific heat of fusion of ice L = 3.3 • 105 J/kg, specific heat of water c2 = 4.19 • 103 J/(kg • K) , specific heat of water vaporization r = 22.6 • 105 J/kg.

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