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One boiler horsepower is equal to the thermal energy rate required to evaporate 34.5 pounds (15.6 kg) of fresh water at 212 °F (100 °C) in one hour. In the early days of steam use, the boiler horsepower was roughly comparable to the horsepower of engines fed by the boiler.
1 PSh = 0.73549875 kW⋅h = 2647.7955 kJ (exactly by definition) The horsepower-hour is still used in the railroad industry when sharing motive power (locomotives). For example, if Railroad A borrows a 2,500 horsepower locomotive from Railroad B and operates it for twelve hours, Railroad A owes a debt of (2,500 hp × 12 h) 30,000 hp⋅h.
Shaft Horsepower (SHP) – The amount of mechanical power delivered by the engine to a propeller shaft. One horsepower is equivalent to 746 watts. Tonnage – A number derived from any of several methods to calculate the volume or other number indicative of a ship's cargo carrying capacity.
746 kW (1,001 hp; 1,015 PS) Plug-in hybrid: GMC Hummer EV Edition 1/EV3X 2022 746 kW (1,000 hp; 1,014 PS) Electric: Bugatti Veyron: 2005 736 kW (987 hp; 1,001 PS) Internal combustion: Fastest road car in 2005 Ferrari SF90 Stradale: 2020 735 kW (986 hp; 1,000 PS) Plug-in hybrid: Up to 2000 units per year planned. [43] [44] Denza Z9/Z9 GT BEV 2024
horsepower-hour: hp⋅h ≡ 1 hp × 1 h = 2.684 519 537 696 172 792 × 10 6 J: inch-pound force: in lbf ≡ g 0 × 1 lb × 1 in = 0.112 984 829 027 6167 J: joule (SI unit) J The work done when a force of one newton moves the point of its application a distance of one metre in the direction of the force. [32] = 1 J = 1 m⋅N = 1 kg⋅m 2 /s 2 ...
1.64 × 10 −27: −238 dBm phys: approximate power of gravitational radiation emitted by a 1000 kg satellite in geosynchronous orbit around the Earth. 10 −24: yocto-(yW) 1 × 10 −24: −210 dBm 10 −21: zepto-(zW) 1 × 10 −21: −180 dBm biomed: approximate lowest recorded power consumption of a deep-subsurface marine microbe [3] 10 ...
The dimension of power is energy divided by time. In the International System of Units (SI), the unit of power is the watt (W), which is equal to one joule per second. Other common and traditional measures are horsepower (hp), comparing to the power of a horse; one mechanical horsepower equals about 745.7 watts.
It is a derived unit that is equal to the energy expended, ... many times the 746 watts in one official horsepower. For tasks lasting a few minutes, a fit human can ...