Older freezers developed a coating of ice inside that had to be melted periodica

Question

Older freezers developed a coating of ice inside that had to be melted periodically; an electric heater could speed this defrosting process. Suppose you're melting ice from your freezer using a heating wire that carries a current of 3.6A when connected to 120 V. a). What is the resistance of the wire? Express your answer to two significant figures and include the appropriate units. b). How long will it take the heater to melt 810 of accumulated ice at -10 ? Assume that all of the heat goes into warming and melting the ice, and that the melt water runs out and doesn't warm further. Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

a) Resistance = V/R = 120/3.6 = 33.33 ohms

b)Lf,water= 3.33x105J/kg,cp,ice= 2090 J/kg

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