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Two common definitions used today are the imperial horsepower as in "hp" or "bhp" which is about 745.7 watts, and the metric horsepower as in "cv" or "PS" which is approximately 735.5 watts. The electric horsepower "hpE" is exactly 746 watts, while the boiler horsepower is 9809.5 or 9811 watts, depending on the exact year.
units: 1 horsepower [21] 7.5 × 10 2: astro: approximately the amount of sunlight falling on a square metre of the Earth's surface at noon on a clear day in March for northern temperate latitudes: 9.09 × 10 2: biomed: peak output power of a healthy human (non-athlete) during a 30-second cycle sprint at 30.1 degree Celsius. [22]
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.
Engine power is the power that an engine can put out. It can be expressed in power units, most commonly kilowatt, pferdestärke (metric horsepower), or horsepower.In terms of internal combustion engines, the engine power usually describes the rated power, which is a power output that the engine can maintain over a long period of time according to a certain testing method, for example ISO 1585.
The foot-pound force (symbol: ft⋅lbf, [1] ft⋅lb f, [2] or ft⋅lb [3]) is a unit of work or energy in the engineering and gravitational systems in United States customary and imperial units of measure. It is the energy transferred upon applying a force of one pound-force (lbf) through a linear displacement of one foot.
Use of a 10-watt flashlight for 1 minute 7.5×10 2 J: A power of 1 horsepower applied for 1 second [59] 7.8×10 2 J: Kinetic energy of 7.26 kg [91] standard men's shot thrown at 14.7 m/s [citation needed] by the world record holder Randy Barnes [92] 8.01×10 2 J
The watt-second is a unit of energy, equal to the joule. One kilowatt hour is 3,600,000 watt seconds. While a watt per hour is a unit of rate of change of power with time, [iii] it is not correct to refer to a watt (or watt-hour) as a watt per hour. [36]
Since 1 N·m = 1 J, and 1 A = 1 C/s, then 1 N·m/A = 1 J·s/C = 1 V·s (same units as back EMF constant). The relationship between and is not intuitive, to the point that many people simply assert that torque and are not related at all. An analogy with a hypothetical linear motor can help to convince that it is true.