a 4-ton air conditioner removes 5.06 × 10 7 j 5.06×107 j (48,000 british thermal units) from a cold environment in 1.00 h. (a) what energy input in joules is necessary to do this if the air conditioner has an energy efficiency rating ( e e r ) (eer) of 12.0? (b) what is the cost of doing this if the work costs 10.0 cents per 3.60 × 10 6 j 3.60×106 j (one kilowatt-hour)? (c) discuss whether this cost seems realistic. note that the energy efficiency rating ( e e r ) (eer) of an air conditioner or refrigerator is defined to be the number of british thermal units of heat transfer from a cold environment per hour divided by the watts of power input.
