How is horsepower expressed?
The horsepower (hp) is a unit in the foot-pound-second ( fps ) or English system, sometimes used to express the rate at which mechanical energy is expended. It was originally defined as 550 foot-pounds per second (ft-lb/s). A power level of 1 hp is approximately equivalent to 746 watt s (W) or 0.746 kilowatt s (kW).
Where is horsepower measured?
dynamometer
The horsepower rating of an engine is usually measured on a dynamometer, which is a form of mechanical brake used to apply variable loads to a running engine so that torque and power may be calculated at different engine revs – hence brake horsepower (which is always quoted at a given RPM).
How is horsepower HP measured?
Horsepower refers to the power an engine produces. It’s calculated through the power needed to move 550 pounds one foot in one second or by the power needs to move 33,000 pounds one foot in one minute. The power is gauged by the rate it takes to do the work.
How do you write horsepower?
The equation to calculate horsepower is simple: Horsepower = Torque x RPM / 5,252. You can use our horsepower calculator below to try it out yourself.
Is brake horsepower the same as horsepower?
HP vs BHP. Traditionally ‘brake horsepower’ (bhp) has been used as the definitive measurement of engine power. It’s distinct from horsepower because it takes into account power loss due to friction – it’s measured by running an engine up to full revs, then letting it naturally slow down to a dead stop.
Which is the correct definition of the unit horsepower?
Written By: Horsepower, the common unit of power; i.e., the rate at which work is done. In the British Imperial System, one horsepower equals 33,000 foot-pounds of work per minute—that is, the power necessary to lift a total mass of 33,000 pounds one foot in one minute.
How many pounds per minute does one horsepower equal?
In the British Imperial System, one horsepower equals 33,000 foot-pounds of work per minute—that is, the power necessary to lift a total mass of 33,000 pounds one foot in one minute. This value was adopted by the Scottish engineer James Watt in the late 18th century, after experiments with strong dray horses,…
Where does the horsepower of an engine come from?
Nominal or rated horsepower is derived from the size of the engine and the piston speed and is only accurate at a steam pressure of 48 kPa (7 psi).
What’s the difference between metric horsepower and mechanical horsepower?
Two common definitions being used today are the mechanical horsepower (or imperial horsepower), which is about 745.7 watts, and the metric horsepower, which is approximately 735.5 watts. Watt defined and calculated the horsepower as 32,572 ft⋅lbf/min, which was rounded to an even 33,000 ft⋅lbf/min.
What is the equation for HP?
Simplify the equation for power: 1 horsepower (hp) = 550 foot-pounds / 1 second. More generally, power = force times distance, divided by time.
What is the unit for horsepower?
Horsepower (metric) Definition: The unit horsepower (symbol: hp) is a unit of measurement of power (the rate at which work is done). Mechanical horsepower, also known as imperial horsepower, is defined as approximately 745.7 watts (550 ft·lbf/s), while metric horsepower is approximately 735.5 watts (75 kgf·m/s).
What is horse power’s units?
The horsepower is a unit of measurement of power. Horsepower (HP) is a non-metric measurement unit of power. There are few definitions of one (1) Horsepower between 735.5 and 750 watts. This web site makes use of so called mechanical horsepower and uses one (1) Horsepower as equal to 745.699872 watts or equal to 550 foot-pounds per second.
What is horsepower in physics?
In mathematical terms, one horsepower is the power needed to move 550 pounds one foot in one second, or the power needed to move 33,000 pounds one foot in one minute. Power, in physics, is defined simply as the rate of doing work.