What type of energy crosses the room boundary, Mechanical Engineering

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What type of energy crosses the room boundary

Consider a well sealed, well insulated room with a common household refrigerator/freezer unit. (a) What type of energy crosses the room boundary? (b) If the refrigerator/freezer operates at 120 V, 4 Amp for four hours a day, how much energy (kW-h) is consumed each day? (c) If electricity cost $0.12/kW-h, how much does it cost to operate the refrigerator in a year?

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