"Units (1960) was designed around the principle of coherence. In SI, which is a coherent system, the unit of power is the watt, which is defined as one joule per second. In the US customary system of measurement, which is non-coherent, the unit of power is the horsepower, which is defined as 550 foot-pounds per second (the pound in this context being the pound-force); similarly the gallon is not equal to a cubic yard (nor is it the cube of any length unit of the system). The earliest units of measure devised by humanity bore no relationship to each other."
"(1850–1922), a daughter, Alice Amelia (1852–1899) and a second son, Henry (born 1854, who died three weeks later). James Prescott Joule James Prescott Joule (; 24 December 1818 11 October 1889) was an English physicist, mathematician and brewer, born in Salford, Lancashire. Joule studied the nature of heat, and discovered its relationship to mechanical work (see energy). This led to the law of conservation of energy, which in turn led to the development of the first law of thermodynamics. The SI derived unit of energy, the joule, is named after him. Joule worked with Lord Kelvin to develop an absolute"
"to energy, namely time. In 1843, James Prescott Joule independently discovered the mechanical equivalent in a series of experiments. The most famous of them used the ""Joule apparatus"": a descending weight, attached to a string, caused rotation of a paddle immersed in water, practically insulated from heat transfer. It showed that the gravitational potential energy lost by the weight in descending was equal to the internal energy gained by the water through friction with the paddle. In the International System of Units (SI), the unit of energy is the joule, named after James Prescott Joule. It is a derived unit."
"James Prescott Joule James Prescott Joule (; 24 December 1818 11 October 1889) was an English physicist, mathematician and brewer, born in Salford, Lancashire. Joule studied the nature of heat, and discovered its relationship to mechanical work (see energy). This led to the law of conservation of energy, which in turn led to the development of the first law of thermodynamics. The SI derived unit of energy, the joule, is named after him. Joule worked with Lord Kelvin to develop an absolute thermodynamic temperature scale, which came to be called the Kelvin scale. Joule also made observations of magnetostriction, and"
"Joule The joule (; symbol: J) is a derived unit of energy in the International System of Units. It is equal to the energy transferred to (or work done on) an object when a force of one newton acts on that object in the direction of its motion through a distance of one metre (1 newton metre or N⋅m). It is also the energy dissipated as heat when an electric current of one ampere passes through a resistance of one ohm for one second. It is named after the English physicist James Prescott Joule (1818–1889). In terms firstly of base"
"physicist and mathematician who discovered the principle of the barometer in 1644. The unit's name ""torr"" is written in lower case, while its symbol (""Torr"") is always written with upper-case initial; including in combinations with prefixes and other unit symbols, as in ""mTorr"" (millitorr) or ""Torr⋅L/s"" (torr-litres per second). The symbol (uppercase) should be used with prefix symbols (thus, mTorr and millitorr are correct, but mtorr and milliTorr are not). The torr is sometimes incorrectly denoted by the symbol ""T"", which is the SI symbol for the tesla, the unit measuring the strength of a magnetic field. Although frequently encountered,"
"Units of energy Because energy is defined via work, the SI unit for energy is the same as the unit of work – the joule (J), named in honor of James Prescott Joule and his experiments on the mechanical equivalent of heat. In slightly more fundamental terms, 1 joule is equal to 1 newton metre and, in terms of SI base units An energy unit that is used in atomic physics, particle physics and high energy physics is the electronvolt (eV). One eV is equivalent to 1.60217653×10 J. In spectroscopy the unit cm = 0.000123986 eV is used to represent"
"James Watt James Watt (; 30 January 1736 – 25 August 1819) was a Scottish inventor, mechanical engineer, and chemist who improved on Thomas Newcomen's 1712 Newcomen steam engine with his Watt steam engine in 1776, which was fundamental to the changes brought by the Industrial Revolution in both his native Great Britain and the rest of the world. While working as an instrument maker at the University of Glasgow, Watt became interested in the technology of steam engines. He realised that contemporary engine designs wasted a great deal of energy by repeatedly cooling and reheating the cylinder. Watt introduced"
"Watt was the sole inventor listed on his six patents: James Watt James Watt (; 30 January 1736 – 25 August 1819) was a Scottish inventor, mechanical engineer, and chemist who improved on Thomas Newcomen's 1712 Newcomen steam engine with his Watt steam engine in 1776, which was fundamental to the changes brought by the Industrial Revolution in both his native Great Britain and the rest of the world. While working as an instrument maker at the University of Glasgow, Watt became interested in the technology of steam engines. He realised that contemporary engine designs wasted a great deal of"
"of engineering. Two of the earliest such units of measure to come into use were the ""horsepower"" and the ""degree Fahrenheit"". The ""horsepower"" was defined by James Watt in 1782 as the power required to raise 33,000 pounds of water through a height of one foot in one minute and the degree Fahrenheit was first defined by Daniel Fahrenheit in about 1713 as being a temperature scale having its lower calibration point (0 °F) at temperature where a supersaturated salt/ice mixture froze and its upper calibration point at body temperature (96 °F). In 1777 the Royal Society, under the chairmanship"
"John Leslie (physicist) Sir John Leslie, FRSE KH (10 April 1766 – 3 November 1832) was a Scottish mathematician and physicist best remembered for his research into heat. Leslie gave the first modern account of capillary action in 1802 and froze water using an air-pump in 1810, the first artificial production of ice. In 1804, he experimented with radiant heat using a cubical vessel filled with boiling water. One side of the cube is composed of highly polished metal, two of dull metal (copper) and one side painted black. He showed that radiation was greatest from the black side and"
"named after Blaise Pascal, noted for his contributions to hydrodynamics and hydrostatics, and experiments with a barometer. The name pascal was adopted for the SI unit newton per square metre (N/m) by the 14th General Conference on Weights and Measures in 1971. The pascal can be expressed using SI derived units, or alternatively solely SI base units, as: where N is the newton, m is the metre, kg is the kilogram, s is the second, and J is the joule. One pascal is the pressure exerted by a force of magnitude one newton perpendicularly upon an area of one square"
"In 1789 he was elected to the elite group, the Smeatonian Society of Civil Engineers. In 1806 he was conferred the honorary Doctor of Laws by the University of Glasgow. The French Academy elected him a Corresponding Member and he was made a Foreign Associate in 1814. The watt is named after James Watt for his contributions to the development of the steam engine, and was adopted by the Second Congress of the British Association for the Advancement of Science in 1889 and by the 11th General Conference on Weights and Measures in 1960 as the unit of power incorporated"
"he found the relationship between the current through a resistor and the heat dissipated, which is also called Joule's first law. His experiments about energy transformations were first published in 1843. James Joule was born in 1818, the son of Benjamin Joule (1784–1858), a wealthy brewer, and his wife, Alice Prescott, on New Bailey Street in Salford. Joule was tutored as a young man by the famous scientist John Dalton and was strongly influenced by chemist William Henry and Manchester engineers Peter Ewart and Eaton Hodgkinson. He was fascinated by electricity, and he and his brother experimented by giving electric"
"William Murdoch William Murdoch (sometimes spelled Murdock) (21 August 1754 – 15 November 1839) was a Scottish engineer and inventor. Murdoch was employed by the firm of Boulton & Watt and worked for them in Cornwall, as a steam engine erector for ten years, spending most of the rest of his life in Birmingham, England. Murdoch was the inventor of the oscillating cylinder steam engine, and gas lighting is attributed to him in the early 1790s, also the term ""gasometer"". However, Archibald Cochrane, ninth Earl of Dundonald, had already in 1789 used gas for lighting his family estate. Murdoch also"
"may derive valuable and fertile methods."" The SI unit of capacitance is named in his honour: the farad. Albert Einstein kept a picture of Faraday on his study wall, alongside pictures of Isaac Newton and James Clerk Maxwell. Physicist Ernest Rutherford stated, ""When we consider the magnitude and extent of his discoveries and their influence on the progress of science and of industry, there is no honour too great to pay to the memory of Faraday, one of the greatest scientific discoverers of all time."" Michael Faraday was born on 22 September 1791 in Newington Butts, which is now part"
"or helix of wire. The term ""inductance"" was coined by Oliver Heaviside in 1886. It is customary to use the symbol formula_1 for inductance, in honour of the physicist Heinrich Lenz. In the SI system, the unit of inductance is the henry (""H""), which is the amount of inductance which causes a voltage of 1 volt when the current is changing at a rate of one ampere per second. It is named for Joseph Henry, who discovered inductance independently of Faraday. Electric circuits which are located close together, so the magnetic field created by the current in one passes through"
"Henry (unit) The henry (symbol: H) is the SI derived unit of electrical inductance. If a current of 1 ampere flowing through the coil produces flux linkage of 1 weber turn, the coil has a self inductance of 1 henry.‌ The unit is named after Joseph Henry (1797–1878), the American scientist who discovered electromagnetic induction independently of and at about the same time as Michael Faraday (1791–1867) in England. The inductance of an electric circuit is one henry when an electric current that is changing at one ampere per second results in an electromotive force of one volt across the"
"volt and farad in honour of Georg Ohm, Alessandro Volta and Michael Faraday respectively. This proposal had the support of William Thomson (Lord Kelvin) who had been instrumental in forming the Committee of Electrical Standards of the British Association for the Advancement of Science. The use of scientists' names for such units was subsequently extended to other units, including the watt named after James Watt and the degree Celsius named after Anders Celsius. Historically, individual units evolved which were based on the size and context of what was being measured. These units could avoid the need to use large numbers"
"Ampere The ampere (; symbol: A), often shortened to ""amp"", is the base unit of electric current in the International System of Units (SI). It is named after André-Marie Ampère (1775–1836), French mathematician and physicist, considered the father of electrodynamics. The International System of Units defines the ampere in terms of other base units by measuring the electromagnetic force between electrical conductors carrying electric current. The earlier CGS measurement system had two different definitions of current, one essentially the same as the SI's and the other using electric charge as the base unit, with the unit of charge defined by"
"as Whittle, Stephenson and Charles Parsons. The following are membership grades with post-nominals : The James Watt International Medal is an award for excellence in engineering established in 1937 by the Institution of Mechanical Engineers. It is named after Scottish engineer James Watt (1736-1819) who developed the Watt steam engine in 1781, which was fundamental to the changes brought by the Industrial Revolution in both his native Great Britain and the rest of the world. The Engineering Heritage Awards were created in 1984 to help recognise and promote the value of artefacts, locations, collections and landmarks of significant engineering importance."
"George Johnstone Stoney George Johnstone Stoney FRS (15 February 1826 – 5 July 1911) was an Irish physicist. He is most famous for introducing the term ""electron"" as the ""fundamental unit quantity of electricity"". He had introduced the concept, though not the word, as early as 1874, initially naming it ""Electrine"", and the word itself came in 1891. He published around 75 scientific papers during his lifetime. Stoney was born at Oakley Park, near Birr, County Offaly, in the Irish Midlands, the son of George Stoney (1792–) and Anne Blood (1801–1883). The Stoney family is an old-established Anglo-Irish family. He"
"the absolute temperature unit, the kelvin, is named after. Sir Joseph Larmor, a physicist and mathematician, made innovations in the understanding of electricity, dynamics, thermodynamics and the electron theory of matter. His most influential work was Aether and Matter, a book on theoretical physics published in 1900. George Johnstone Stoney introduced the term ""electron"" in 1891. John Stewart Bell was the originator of Bell's Theorem and a paper concerning the discovery of the Bell-Jackiw-Adler anomaly and was nominated for a Nobel prize. The astronomer Jocelyn Bell Burnell, from Lurgan, County Armagh, discovered pulsars in 1967. Notable mathematicians include Sir William"
"of the Rothschilds' banks, the U.S. Federal Reserve, the International Monetary Fund, and the World Bank). John Robison (physicist) John Robison FRSE LLD (4 February 1739 – 30 January 1805) was a British physicist and mathematician. He was a professor of natural philosophy (the precursor of natural science) at the University of Edinburgh. A member of the Edinburgh Philosophical Society when it received its royal warrant, he was appointed as the first general secretary to the Royal Society of Edinburgh (1783–98). Robison invented the siren and also worked with James Watt on an early steam car. Following the French Revolution,"
"from 1915 to 1920. In 1991, the thomson (symbol: Th) was proposed as a unit to measure mass-to-charge ratio in mass spectrometry in his honour. J J Thomson Avenue, on the University of Cambridge campus, is named after Thomson. In November 1927, J.J. Thomson opened the Thomson building, named in his honour, in the Leys School, Cambridge. J. J. Thomson Sir Joseph John Thomson (18 December 1856 – 30 August 1940) was an English physicist and Nobel Laureate in Physics, credited with the discovery and identification of the electron; and with the discovery of the first subatomic particle. In 1897,"
"Jules Violle Jules Louis Gabriel Violle (16 November 1841, Langres, Haute-Marne – 12 September 1923, Fixin, Bourgogne-Franche-Comté) was a French physicist and inventor. He is notable for having determined the solar constant at Mont Blanc in 1875, and, in 1881, for proposing a standard for luminous intensity, called the Violle, equal to the light emitted by 1 cm² of platinum at its melting point. (It was notable as the first unit of light intensity that did not depend on the properties of a particular lamp, but it was made obsolete by the candela, the standard SI unit.) Throughout his life,"
"times due to public resistance, until in 2009 the requirement to ultimately cease use of traditional units alongside metric units was finally removed. British scientists, philosophers and engineers have been at the forefront of the development of metrication – in 1670 John Wilkins first proposed a decimal system of measure, in 1861 a committee of the British Association for Advancement of Science (BAAS), including William Thomson (later Lord Kelvin), James Clerk Maxwell and Joule among its members, defined various electrical units in terms of metric rather than imperial units, and in the 1870s Johnson, Matthey & Co manufactured the international"
"of one gram of water by one Kelvin. He announced his results at a meeting of the chemical section of the British Association for the Advancement of Science in Cork in August 1843 and was met by silence. Joule was undaunted and started to seek a purely mechanical demonstration of the conversion of work into heat. By forcing water through a perforated cylinder, he could measure the slight viscous heating of the fluid. He obtained a mechanical equivalent of 770 ft·lbf/Btu (4.14 joule/calorie (J/cal)). The fact that the values obtained both by electrical and purely mechanical means were in agreement"
"Ampère was elected a Foreign Member of the Royal Society and in 1828, a foreign member of the Royal Swedish Academy of Science. In recognition of his contribution to the creation of modern electrical science, an international convention, signed at the 1881 International Exposition of Electricity, established the ampere as a standard unit of electrical measurement, along with the coulomb, volt, ohm, and watt, which are named, respectively, after Ampère's contemporaries Charles-Augustin de Coulomb of France, Alessandro Volta of Italy, Georg Ohm of Germany, and James Watt of Scotland. Ampère's name is one of the 72 names inscribed on the"
"the Royal Society. Henry Cavendish was even better known than his father for electrical experiments, and also for other discoveries in physics, including the famous torsion-balance measurement of the mass of the earth. One of Charles Cavendish's experiments with electricity appears to have been an attempt to replicate the plasma glow seen during the early Francis Hauksbee experiment with a semi-vacuum in the friction-generator's glass globe. A recent thesis on plasma arcs mentions Priestley's account of a replication of this by the experimenter Benjamin Wilson (1721–1788): Lord Charles Cavendish Lord Charles Cavendish FRS (17 March 1704 – 28 April 1783)"
"Typical circuit breakers will provide 16 A. The current drawn by a number of typical appliances are: Ampere The ampere (; symbol: A), often shortened to ""amp"", is the base unit of electric current in the International System of Units (SI). It is named after André-Marie Ampère (1775–1836), French mathematician and physicist, considered the father of electrodynamics. The International System of Units defines the ampere in terms of other base units by measuring the electromagnetic force between electrical conductors carrying electric current. The earlier CGS measurement system had two different definitions of current, one essentially the same as the SI's"
"value for the mechanical equivalent of heat, some 14% lower than the modern value (4.1860 J·cal) at a time when Joule had measured 4.159 J·cal. A subsequent calculation by Colding in 1852 yielded a value only 3% below modern values. Colding's thermodynamic work was neglected both in his native Denmark and internationally though, from an historical perspective, he seems to deserve no less credit in the development of the concept of energy than Joule or Mayer. However, his contributions to meteorology and the built environment of Copenhagen are notable in themselves. Ludwig A. Colding Ludwig August Colding (13 July 1815"
"James Watt International Gold Medal The James Watt Medal is an award for excellence in engineering established in 1937, conferred by the Institution of Mechanical Engineers in the United Kingdom. It is named after Scottish engineer James Watt (1736–1819) who developed the Watt steam engine in 1781, which was fundamental to the changes brought by the Industrial Revolution in both his native Great Britain and the rest of the world. The ""James Watt International Gold Medal"" is awarded by the British to an outstanding mechanical engineer. Recipients of the James Watt International Gold Medal are: The ""James Watt Medal"" is"