![]() One watt is also equal to the power produced in a circuit with a voltage potential of one volt with a current of one amp. One watt is the power equal to the rate of energy of one joule per second in an electrical circuit. Try our engine horsepower calculator to calculate the power of a motor. Horsepower were later used to measure the power output of piston and turbine engines and electrical motors. The term horsepower was adopted by Scottish inventor James Watt to measure the power output of his steam engine and to compare that power with that of horses horses. īoiler horsepower can be abbreviated as hp(S) for example, 1 boiler horsepower can be written as 1 hp(S). One boiler horsepower is equal to the power needed to evaporate 34.5 pounds in one hour. Boiler Horsepowerīoiler horsepower is used to measure the power of a boiler to generate steam. ![]() For example, 1 metric horsepower can be written as 1 hp(M), 1 PS, 1 cv, 1 hk, 1 pk, 1 ks, or 1 ch. Metric horsepower can be abbreviated as hp(M), and are also sometimes abbreviated as PS, cv, hk, pk, ks, or ch. The metric horsepower is a non-SI metric unit for power. ![]() One metric horsepower is equal to 735.49875 watts. One metric horsepower is the power needed to one metric horsepower as the lift a 75 kilogram mass at at one meter per second. Electric horsepower can be abbreviated as hp(E) for example, 1 electric horsepower can be written as 1 hp(E). The electric horsepower is a US customary and imperial unit of power. One electric horsepower is equal to exactly 746 watts. Electric HorsepowerĮlectric horsepower is used to measure the output of electric motors and other electrical machines in the US. Mechanical horsepower can be abbreviated as hp(I) for example, 1 mechanical horsepower can be written as 1 hp(I). The mechanical horsepower is a US customary and imperial unit of power. One mechanical horsepower is equal to 745.69987158227022 watts. Mechanical horsepower is often used to measure the output of engines and motors in North America. Mechanical and electrical are the most commonly used. How to Convert Horsepower (metric) to WattĮxample: convert 15 horsepower (metric) to W:ġ5 horsepower (metric) = 15 × 735.49875 W = 11032.There are several types of horsepower, including mechanical, electrical, metric, boiler, brake, and indicated, and they all have different applications in industry. Horsepower (metric) to Watt Conversion Table Horsepower (metric) The watt as a unit of power should not be confused with its energy counterpart, the watt-hour (and all its multiples/submultiples). The absolute watt was adopted as the SI unit of power in 1960.Ĭurrent use: As the SI derived unit of power, the watt in all its multiples and submultiples is used in many applications worldwide from radio transmission to use in the electric power industry. 1 absolute watt is equal to 1.00019 international watts. These were used until 1948 when the General Conference on Weights and Measures re-defined the watt to absolute units, using only mass, time, and length. In 1908, the "international" definitions were defined, with Siemens' definition being adopted as the international watt. It was first proposed in 1882 by William Siemens who defined it as "the power conveyed by a current of an Ampere through the difference of potential of a Volt." This was the definition used at the time within the existing system of units. History/origin: The watt is named after James Watt, a Scottish inventor. It is defined as 1 joule per second and is used to quantify the rate of energy transfer. Wattĭefinition: A watt (Symbol: W) is the SI (International System of Units) derived unit of power. The term was later expanded to include other types of output power such as the imperial and metric horsepower measurements commonly used today. It is believed that Watt built on this idea and introduced the term horsepower, largely in an effort to market his steam engine. As early as 1702, Thomas Savery referenced horses when describing the output of an engine. Watt was not the first person to compare the output of horses to that of engines. History/origin: The term horsepower was adopted in the late 18 th century by James Watt to compare the output of steam engines with the power of draft horses. In addition, when rating electric motors, one horsepower is equal to 746 watts. Boiler horsepower, albeit a less common measurement than either imperial or metric horsepower, is used for rating steam boilers, and is equivalent to 34.5 pounds of water evaporated per hour at 212 degrees Fahrenheit, or 9809.5 watts.
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