Nous utilisons des cookies afin de fournir à nos utilisateurs le contenu et les annonces qu'ils veulent et d'analyser notre trafic. Ces cookies sont nécessaires au bon fonctionnement du site TranslatorsCafe. Vous pouvez configurer votre navigateur pour bloquer ces cookies. Cependant, certaines parties du site ne convertisseur kw en cv pas dans ce cas. Si vous poursuivez sans modifier vos paramètres, nous supposerons que vous ne voyez pas d'inconvénients à recevoir tous les cookies de notre site. It can pull 12 cars with 1800 passengers. Overview Power in physics is the ratio of work to time. Here work refers to the amount of force F needed to move a body along the distance s. It could also be defined as the speed of energy transfer. Along with watts, horsepower as a unit is convertisseur kw en cv used. Until the invention of engines, power was not measured formally, and there were no units associated with it. After the steam engine was invented, James Watt, an inventor and an engineer, worked on improving it and on making it more efficient. Power is one indicator of efficiency — if a given engine is modified and its power output increases, so does its efficiency. To show efficiency of the improved engine Watt suggested horsepower as a unit of power. 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. Thus, having a standardized measure was useful for comparing the power output between different engines and horses. This measure was later used for other machines such as automobiles. Watt measured this unit of power by observing and evaluating the work of draft horses in a mill. One horsepower is equivalent to 746 watts. It is now convertisseur kw en cv that horses are not capable of working at this capacity for a long period of time, but the unit stays unchanged. Even though watts as a unit have existed nearly as long as horsepower, the latter is more commonly used in automobile industry. Light fixtures sometimes allow only light bulbs of or below a certain power, for example 60 watts. This is because light bulbs with greater power may damage the lamp or the fixture due to heat they produce. In household lighting this problem may be solved by using lamps that are not incandescent, as those generally consume considerably less power for the same brightness output. Most manufacturers are working on improving the efficiency of appliances, as well as light bulbs. Brightness or luminosity of a light bulb depends on power and on the type of bulb. It is measured in lumens. Below is a comparison of power of different light sources for home use, with luminous power information. Some countries implemented or are planning to implement a ban on incandescent lights because of their low energy efficiency. Power of household appliances differs by the maker and the model and they have different power while performing different types of work, but here are some examples of average and approximate values. Work produced by animals and humans can be measured using power. For example, 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. For example, this calculator shows that a person 170 cm tall and weighing 70 kg will produce a power output of 39. 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. Dynamometers Power can be measured by a special device, a dynamometer. Dynamometers can also measure torque and force. They can have a range of applications, from the engineering to the medical field. For example, dynamometers can help measure and evaluate the power output of engines. There are two types of dynamometers, the engine and the chassis type. Engine dynamometers can only work with engines, taken out of the vehicle or machine, but they are more accurate. Chassis ones can be used more easily, but are less accurate and more expensive. A chassis dynamometer can measure torque and convertisseur kw en cv delivered by the power train of a vehicle Dynamometers can also be used to calculate strength of people for sports or medical reasons. They are usually the isokinetic type. An isokinetic dynamometer consists of an exercise machine with sensors, connected to a computer. It measures strength of different muscle groups. Along with the overall measurements for the body, they can measure the power output for specific muscle groups. They can be programmed to provide warnings when a given power threshold is exceeded. This is useful for people with injuries undergoing rehabilitation, or for those who want to carefully monitor their exercise routines. According to some theories of exercise, the biggest improvement in performance happens at a certain range of stimulus for a given individual. 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. 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. 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. Cet article a été rédigé par. Convertisseur de puissance En physique, puissance désigne le rythme auquel le travail est effectué ou l'énergie est transférée. 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. La puissance électrique se définit comme le volume de travail effectué par un courant électrique, ou le rythme auquel l'énergie est transmise. Sur cette calculatrice, la notation E est utilisée pour représenter les numéros trop petits ou trop grands. La notation E est fréquemment utilisée sur les calculatrices et par les scientifiques, mathématiciens et ingénieurs. Nous travaillons dur pour garantir que les résultats présentés par les convertisseurs et calculatrices de TranslatorsCafe. Tout le contenu est fourni « tel quel », sans aucune garantie.
