![]() ![]() Power also is measured in dBm, a relative logarithmic measure with 1 milliwatt as reference, calories per hour, Btu per hour (Btu/h).Įlectric power is defined as the amount of work done by an electric current, or the rate at which electrical energy is transmitted. One horsepower is equivalent to 33,000 foot-pounds per minute, or the power required to lift 550 pounds by one foot in one second, and is equivalent to about 746 watts. Other units of power include ergs per second (erg/s), horsepower (hp), and foot-pounds per minute. 1 watt is equal to 1 joule per second (J/s). ![]() In the SI system, power is measured in watts (W). In physics, power is the rate at which work is performed or energy is transferred. This article was written by Kateryna YuriĬommon Unit ConvertersLength, mass, volume, area, temperature, pressure, energy, power, speed and other popular measurement unit converters. Power is one of the easiest ways to measure this stimulus by tracking the response of the athlete to the stimulus with a dynamometer therefore it is a useful concept in exercise. For exercises that depend on the environment, such as cycling and swimming, it is difficult to measure the stimulus, because one has to consider various environmental aspects such as the effect of wind or the conditions of the ground or water on the strain, produced by exercise. When the exercise is too easy, there is no improvement, and when the exercise is too difficult, the athlete may have poor performance due to overstraining. This is useful for people with injuries undergoing rehabilitation, or for those who want to carefully monitor their exercise routines.Īccording to some theories of exercise, the biggest performance improvement happens at a certain range of stimuli for a given individual. They can be programmed to provide warnings when a given power threshold is exceeded. Along with the overall measurements for the body, they can measure the power output for specific muscle groups. It measures the strength of different muscle groups. An isokinetic dynamometer consists of an exercise machine with sensors, connected to a computer. Some athletes use special devices for these calculations, record their performance with respect to power output, and then analyze it to determine the effectiveness of their workout program.Ī chassis dynamometer can measure torque and power delivered by the power train of a vehicleĭynamometers can also be used to calculate the strength of people for sports or medical reasons. For example, this calculator shows that a person 170 cm tall and weighing 70 kg will produce a power output of 39.5 watts by doing 50 push-ups for 10 minutes. Some websites help athletes calculate the work performed and the power output for different types of physical exercises, based on the weight of the athlete and of the equipment used, the distance traveled, estimated using the athlete’s height for exercises like weight lifting, and the exercise duration. For example, the power of an athlete throwing a basketball can be calculated by finding the force, with which she propels the ball for a given distance and the time during which she completes this work. Work produced by animals and humans can be measured using power. Machines are not the only objects that can be evaluated through power. Residential split system air conditioners: 20–40 kilowatts.Even though watts as a unit have existed nearly as long as horsepower, the latter is more commonly used in the automobile industry.ĥ050 LED strip. It is now believed that horses are not capable of working at this capacity for a long period of time, but the unit stays unchanged. One horsepower is equivalent to 746 watts. Watt measured this unit of power by observing and evaluating the work of draft horses in a mill. This measure was later used for other machines such as automobiles. ![]() Thus, having a standardized measure was useful for comparing the power output between different engines and horses. Until the invention of engines, humans relied mainly on human and animal manual labor, so it was natural for Watt to compare the power output of the new steam engine with the power of horses, especially because not every mine where he marketed his steam engine used technology some used only horses. To show the efficiency of the improved engine Watt suggested horsepower as a unit of power. Power is one indicator of efficiency - if a given engine is modified and its power output increases, so does its efficiency. After the steam engine was invented, James Watt, an inventor and engineer, worked on improving it and on making it more efficient. Until the invention of engines, power was not measured formally, and there were no units associated with it. Along with watts, horsepower as a unit is also used. Power is measured in joules per second, or watts. 2 hp or 1.5 kW horse-drawn wagon with 20 passengers Units ![]()
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