Random converter | ## Convert milliwatt [mW] to Btu (IT)/hour [Btu/h]1 milliwatt [mW] = 0/00341214163312794 Btu (IT)/hour [Btu/h] ## The Metric System and the SIDid you know that only seven base units are used in the SI and all other units are derived from these seven units? Click or tap to find out more! The power output of this GO Train locomotive MP40PH-3C made by Motive Power (Wabtec) is 4000 hp or 3000 kW. It can pull 12 cars with 1800 passengers. Overview Units Power of Household Appliances Power in Sports Dynamometers ## OverviewPower in physics is the ratio of work to time. Here, work refers to the amount of force ## UnitsPower is measured in joules per second, or watts. Along with watts, horsepower as a unit is also 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 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 the 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 believed 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 the automobile industry. 60 W incandescent lamp ## Power of Household AppliancesHousehold appliances generally have their power indicated on them. 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 the 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. The brightness or luminosity of a light bulb depends on power and the type of bulb. It is measured in lumens. Below is a comparison of the power of different light sources for home use, with luminous power information. - 450 lumens:
- Incandescent: 40 watts
- Compact fluorescent: 9–13 watts
- LED: 4–9 watts
- 800 lumens:
- Incandescent: 60 watts
- Compact fluorescent: 13–15 watts
- LED: 10–15 watts
- 1600 lumens
- Incandescent: 100 watts
- Compact fluorescent: 23–30 watts
- LED: 16–20 watts
- Residential split system air conditioners: 20–40 kilowatts
- Window air conditioners: 1–2 kilowatts
- Ovens: 2.1–3.6 kilowatts
- Washers and dryers: 2–3.5 kilowatts
- Dishwashers: 1.8–2.3 kilowatts
- Electric pots: 1–2 kilowatts
- Microwave ovens: 0.65–1.2 kilowatts
- Refrigerators: 0.5–1 kilowatt
- Toasters: 0.7–0.9 kilowatts
12 W and 7 W fluorescent lamps It is evident from the comparison above that the LEDs require less power, thus they are more efficient in operation. A unit price for an LED light is still high compared to incandescent lights, but over the long-term use, it is cost-efficient. Some countries implemented or are planning to implement a ban on incandescent lights because of their low energy efficiency. The 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. 5050 LED strip. One LED consumes approximately 200 mW ## Power in SportsMachines are not the only objects that can be evaluated through power. Work produced by animals and humans can be measured using power. 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. 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, according to one of these calculators, the power of a person 170 centimeters tall and weighing 70 kilograms who did 50 push-ups in 10 minutes is 39.5 watts. 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. ## DynamometersPower can be measured by a special device, a dynamometer. Dynamometers can also measure torque and force. They can have a range of applications, from 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 power delivered by the power train of a vehicle Dynamometers can also be used to calculate the 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 the 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 performance improvement happens at a certain range of stimuli 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. References This article was written by Kateryna Yuri Convert megajoule/second to megawatt Convert watt to newton meter/second Convert joule/second to watt Convert horsepower to kilocalorie (th)/hour Convert erg/second to watt Convert watt to Btu (IT)/hour Convert horsepower to kilowatt Convert kilowatt to kilocalorie (IT)/hour ## You may be interested in other converters in the Common Unit Converters group:Length and Distance Converter Mass Converter Dry Volume and Common Cooking Measurements Area Converter Volume and Common Cooking Measurement Converter Temperature Converter Pressure, Stress, Young’s Modulus Converter Energy and Work Converter Force Converter Time Converter Linear Speed and Velocity Converter Angle Converter Fuel Efficiency, Fuel Consumption, and Fuel Economy Converter Numbers Converter Converter of Units of Information and Data Storage Metric Prefixes Converter Data Transfer Converter Currency Exchange Rates Men’s Clothing and Shoe Sizes Women’s Clothing and Shoe Sizes Compact Calculator Full Calculator Unit definitions Online Unit Converters Common Unit Converters Do you have difficulty translating a measurement unit into another language? Help is available! Post your question in TCTerms and you will get an answer from experienced technical translators in minutes. |

### Common Unit Converters

Length, mass, volume, area, temperature, pressure, energy, power, speed and other popular measurement unit converters.

### Power Converter

In physics, **power** is the rate at which work is performed or energy is transferred.

In the SI system, power is measured in **watts** (W). 1 watt is equal to 1 joule per second (J/s). Other units of power include **ergs per second** (erg/s), **horsepower** (hp), and **foot-pounds per minute**. 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. Power also is measured in **dBm**, a relative logarithmic measure with 1 milliwatt as reference, **calories per hour**, **Btu per hour** (Btu/h).

**Electric power** is defined as the amount of work done by an electric current, or the rate at which electrical energy is transmitted. The SI unit of electric power is the watt.

### Using the Power Converter Converter

This online unit converter allows quick and accurate conversion between many units of measure, from one system to another. The Unit Conversion page provides a solution for engineers, translators, and for anyone whose activities require working with quantities measured in different units.

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You can use this online converter to convert between several hundred units (including metric, British and American) in 76 categories, or several thousand pairs including acceleration, area, electrical, energy, force, length, light, mass, mass flow, density, specific volume, power, pressure, stress, temperature, time, torque, velocity, viscosity, volume and capacity, volume flow, and more. **Note:** Integers (numbers without a decimal period or exponent notation) are considered accurate up to 15 digits and the maximum number of digits after the decimal point is 10.

In this calculator, E notation is used to represent numbers that are too small or too large. **E notation** is an alternative format of the scientific notation a · 10^{x}. For example: 1,103,000 = 1.103 · 10^{6} = 1.103E+6. Here E (from exponent) represents “· 10^”, that is “*times ten raised to the power of*”. E-notation is commonly used in calculators and by scientists, mathematicians and engineers.

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