Wiktor Wise
Horsepower (HP) is a unit of measurement of power, or the rate at which work is done. It is defined as the work done by a force of 550 pounds acting through one foot in one second, or 33,000 pounds of force over the course of a minute. One HP is equivalent to 746 watts of electrical power. HP is often used as a measure of engine power and other mechanical devices, such as generators and pumps. It can also be used to describe the amount of power that an electric motor can generate.
| Characteristics | Values |
|---|---|
| Full Form | Horsepower (HP) |
| Definition | A unit of measurement of power, or the rate at which work is done |
| Origin | 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 |
| Calculation | 1 hp = 550 ft⋅lbf/s or 745.7 W |
| Conversion | To convert from kilowatts to horsepower, multiply by 1.34 |
| Usage | Used to describe the amount of power that an electric motor can generate |
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What You'll Learn
Horsepower (hp) is a unit of power
Horsepower is also used to describe the amount of power generated by electric motors. A small electric motor might have a horsepower of 1, while a larger one could have a horsepower of 10. It can further be employed to measure the power output of electric cars. The term bhp fell into disuse in the United States in 1971–1972 as automakers started quoting power in terms of SAE net horsepower.
The horsepower metric was invented by Scottish engineer James Watt in the late 18th century to compare the output of steam engines with the power of draft horses. According to a common legend, Watt's customer, a brewer, demanded an engine that matched the power of a horse, and Watt built a machine that was even stronger. The horsepower metric defines the work done by a force of 550 pounds acting through one foot in one second, which is equivalent to 33,000 pounds of force over a minute. This can also be expressed as 550 ft⋅lbf/s or 375 lbf⋅mph.
Horsepower can be converted to kilowatts by multiplying by 1.34, and 1 hp is approximately equal to 0.746 kW. While horsepower, watts, and kilowatts are reducible to the same dimensional units, horsepower is rarely used outside of mechanical contexts.
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1 hp = 746 watts
Horsepower (HP) is a unit of power or the rate at which work is done. It is often used to measure the power of engines and other mechanical devices. HP is a unit of measurement in the foot-pound-second (fps or ft-lb/s) or English system. It is defined as the work done by a force of 550 pounds acting through one foot in one second, or the unit of power needed to raise 550 pounds one foot in one second. This is equivalent to 745.7 watts.
HP was invented by Scottish engineer James Watt in the late 18th century to compare the output of steam engines with the power of draft horses. According to a common legend, the unit was created when one of Watt's first customers, a brewer, demanded an engine that would match the power of a horse. Watt built a machine that was even stronger than the brewer's horse, and the output of that machine became the horsepower.
Today, horsepower is used to describe the amount of work done by machines such as generators and pumps, as well as the power output of electric motors and cars. For example, a small generator might have a horsepower of 5, while a large diesel engine generator could have a horsepower of 500. Similarly, a small electric motor might have a horsepower of 1, while a large one could have a horsepower of 10.
When converting from kilowatts to horsepower, the value in kilowatts is multiplied by 1.34. While horsepower, watts, and kilowatts are all reducible to the same dimensional units, horsepower is rarely used to express power in any form other than mechanical. In the United States, the term bhp (brake horsepower) fell into disuse in 1971–1972 as automakers began to quote power in terms of SAE net horsepower.
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hp is used to measure engine power
Horsepower (HP) is a unit of measurement of power, or the rate at which work is done. It is a practical unit of power representing the ability to do work by some kinds of electrical equipment. HP is often used as a measure of engine power and other mechanical devices. 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 was invented by Scottish engineer James Watt in the late 18th century to compare the output of steam engines with the power of draft horses. According to a common legend, the unit was created when one of Watt's first customers, a brewer, demanded an engine that would match a horse. Watt built a machine that was even stronger than the brewer's horse, and the output of that machine became the horsepower.
The horsepower metric is defined as the work done by a force of 550 pounds acting through one foot in one second, or 33,000 pounds of force over the course of a minute. This can also be calculated as 550 ft⋅lbf/s, with 1 ft = 0.3048 m, 1 lbf ≈ 4.448 N, 1 J = 1 N⋅m, and 1 W = 1 J/s, resulting in 1 hp ≈ 745.7 W. This is equivalent to 746 watts of electrical power, or 0.746 kilowatts.
Horsepower can be used to describe the amount of work done by machines such as generators and pumps. It can also be used to measure the power output of electric cars and motors. While horsepower, watt, and kilowatt are all reducible to the same dimensional units, horsepower is rarely used to express power in any form other than mechanical.
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hp is rarely used outside of mechanical power
The horsepower metric defines the work done by a force of 550 pounds acting through one foot in one second, which is equivalent to 746 watts of electrical power. It is a unit of measurement of power, or the rate at which work is done. It is often used as a measure of engine power and other mechanical devices, 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 bhp of 500.
Horsepower was invented by Scottish engineer James Watt in the late 18th century to compare the output of steam engines with the power of draft horses. Watt accepted the challenge of creating an engine that would match a horse and ended up building a machine that was even stronger than the figure achieved by the brewer. The output of that machine became the horsepower.
While horsepower, watts, and kilowatts are all reducible to the same dimensional units, horsepower is rarely used to express power outside of mechanical power. This is because it is not as accurate as other units of measurement. For example, in 1972, the PS (Pferdestärke, or the metric horsepower) was replaced by the kilowatt as the official power-measuring unit in EEC directives. Other names for the metric horsepower are the Italian cavallo vapore (cv), Dutch paardenkracht (pk), and the French cheval-vapeur (ch).
Despite this, horsepower is still widely used in some industries, such as the drilling industry. It is also used to describe the amount of power that an electric motor can generate. For example, a small electric motor might have a horsepower of 1, while a large one could have a horsepower of 10. It can also be used to measure the power output of electric cars.
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hp was invented by James Watt
The term "horsepower" was invented by Scottish engineer James Watt, who is known for his improvements to the steam engine. Watt created the term to compare the power of his engines to the power a horse could output, providing a tangible understanding of his invention's capabilities.
According to a common legend, one of Watt's first customers, a brewer, demanded an engine that matched the strength of a horse. The customer chose his strongest horse and drove it to its limit. Watt accepted the challenge and built a machine that surpassed the brewer's horse, and the output of that machine became the horsepower.
Watt defined one horsepower as "the amount of work required from a horse to pull 150 pounds out of a hole that was 220 feet deep." By comparing his engine's sustained power output to a horse's average power over a day, Watt could showcase his invention's advantages. While a horse's maximum output is around 15 horsepower, its average output over a workday is approximately one horsepower.
It is important to note that the term "horsepower" may be slightly misleading. The maximum output of a horse can be up to 15 horsepower, while the output of an average human can exceed one horsepower, especially in the case of extreme athletes.
Over time, the definition of horsepower has been refined and adapted to various systems of measurement. In modern terms, one horsepower is approximately equal to 745.7 watts.
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Frequently asked questions
HP stands for horsepower, a unit of power.
Horsepower is calculated by multiplying the amount of force (in pounds) by the speed (in feet per second).
The formula for horsepower is 550 ft⋅lbf/s.
1 hp is equivalent to 746 watts or 0.746 kilowatts.
The term horsepower was invented by Scottish engineer James Watt in the late 18th century. The unit was created when Watt accepted the challenge of a brewer, a customer of his, to build an engine that would match a horse.
