Older freezers made a coating of ice within that had to be melted from time to time; an electric heater could speed this defrosting method. Assume that you are melting ice from your freezer by using a heating wire which carries a current of 3.4 when joined to 120.
Then find out the resistance of the wire?
How long will it take the heater to melt 780 of collected ice at -10? Suppose that all of the heat goes into warming and melting the ice, and that the melt water runs out and does not warm further.