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Electricity is a form of energy. In case of household appliances consumption of energy also takes into account the efficiency of its usage. No process is wholly (100%) efficient due to the ever present frictional losses. Efficiency decreases dramatically in reverse thermal engines (refrigerators) due to the low range of temperatures between the hot and cold reservoirs (normally the radiator of the refrigerator and the room temperature. Normal efficiency (theoretical) for such a domestic appliance is about 0.7% for the temperatures of 20oC in the room and 40oC at the radiator fins of the refrigerator Air conditioners also have similar efficiency for example an 18000 BTU A.C. (1.5 Ton) produces a cooling of 61.4 kilo Watts for a power consumption of 11,880 kilo Watts, again an efficiency of less than 1% Air conditioners thus use the largest amount of electricity in domestic appliances

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