ENERGY is described as THE CAPACITY TO DO WORK. WORK is defined as FORCE MULTIPLIED BY THE DISTANCE THROUGH WHICH IT TRAVELS.
The unit of work is called the foot-pound. One foot-pound is the amount of work done in • lifting a one-pound weight a vertical distance of one foot. Work is sometimes expressed in inch-pounds. In this case, the distance through which the force acts is measured in inches.
Example: Calculate the work done in foot-pounds when lifting a weight of 2000 pounds a vertical distance of 10 feet.
Work = Force x Distance
= 2000 x 10 = 20,000 foot-pounds or expressed in inch units.
2000 x 10 x 12 = 240,000 inch-pounds
Energy is the ability to do work. The electric motor supplies the energy to drive the refrigerator compressor.
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Basics of Refrigeration