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 3.2 A when connected to 120 V.

What is the resistance of the wire? R =38

How long will it take the heater to melt 840 g of accumulated ice at -10C ? 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.

Explanation / Answer

R=120/3.2=37.5

Energy required in melting = 334*840 =280.56x103 Joule

E= V*I*t
t=729.166 sec
t= 12.152 min

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