For example, the power of an athlete throwing a basketball can be calculated by finding the force, with which she propels the ball for a given distance and the time during which she completes this work. Work produced by animals and humans can be measured using power. Machines are not the only objects that can be evaluated through power. Residential split system air conditioners: 20–40 kilowatts.Even though watts as a unit have existed nearly as long as horsepower, the latter is more commonly used in the automobile industry.ĥ050 LED strip. It is now believed that horses are not capable of working at this capacity for a long period of time, but the unit stays unchanged. One horsepower is equivalent to 746 watts. Watt measured this unit of power by observing and evaluating the work of draft horses in a mill. This measure was later used for other machines such as automobiles. Thus, having a standardized measure was useful for comparing the power output between different engines and horses.
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Until the invention of engines, humans relied mainly on human and animal manual labor, so it was natural for Watt to compare the power output of the new steam engine with the power of horses, especially because not every mine where he marketed his steam engine used technology some used only horses. To show the efficiency of the improved engine Watt suggested horsepower as a unit of power. Power is one indicator of efficiency - if a given engine is modified and its power output increases, so does its efficiency. After the steam engine was invented, James Watt, an inventor and engineer, worked on improving it and on making it more efficient. Until the invention of engines, power was not measured formally, and there were no units associated with it. Along with watts, horsepower as a unit is also used. Power is measured in joules per second, or watts. 2 hp or 1.5 kW horse-drawn wagon with 20 passengers Units
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