Horsepower is also used to describe the amount of work done by machines such as generators and pumps. For example, a small car might have a brake horsepower (bhp) of 100, while a large truck could have a brake horsepower of 500. Horsepower is often used as a measure of engine power and other mechanical devices. The horsepower metric defines the work done by a force of 550 pounds acting through one foot in one second, which extrapolates to 33,000 pounds of force over the course of a minute. For example, you might say that someone is "as strong as a horse" if they are very muscular. The term horsepower is also sometimes used informally to describe a person's physical strength. But it's also used to express the power that a machine, motor or engine produces. Horsepower is often used to describe the power of cars, trucks and other vehicles.
The engine horsepower would be 400 (200 x 2). So, let's say your car's engine can generate 200 pounds of force and move at a speed of 2 feet per second. The answer is simple: horsepower is calculated by multiplying the amount of force (in pounds) by the speed (in feet per second). Watt realized that horsepower could be used to express the rate of engine power. Scottish Engineer James Watt invented the horsepower metric in the late 18th century to compare the output of steam engines with the power of draft horses. The horsepower metric is defined as the work done by a force of 550 pounds acting through one foot in one second, or foot-pounds of work, the unit of power needed to raise 550 pounds one foot in one second. Horsepower (hp) is a unit of measurement in the foot-pound-second ( fps or ft-lb/s) or English system, sometimes used to express the rate at which mechanical energy is expended.
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