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Topic: SI electromagnetism units

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	Electromagnetism - Wikipedia, the free encyclopedia
		Electromagnetism is the physics of the electromagnetic field: a field, encompassing all of space, which exerts a force on those particles that possess the property of electric charge, and is in turn affected by the presence and motion of such particles.
		An accurate theory of electromagnetism, known as classical electromagnetism, was developed by various physicists over the course of the 19th century, culminating in the work of James Clerk Maxwell, who unified the preceding developments into a single theory and discovered the electromagnetic nature of light.
		In classical electromagnetism, the electromagnetic field obeys a set of equations known as Maxwell's equations, and the electromagnetic force is given by the Lorentz force law.
	en.wikipedia.org /wiki/Electromagnetism (1190 words)

	Electricity - Wikipedia, the free encyclopedia
		Electric charge is a property of certain subatomic particles (e.g., electrons and protons) which interacts with electromagnetic fields and causes attractive and repulsive forces between them.
		The electric potential difference between two points is defined as the work done per unit charge (against electrical forces) in moving a positive point charge slowly between two points.
		If one of the points is taken to be a reference point with zero potential, then the electric potential at any point can be defined in terms of the work done per unit charge in moving a positive point charge from that reference point to the point at which the potential is to be determined.
	www.wikipedia.org /wiki/Electric (2057 words)

	Watt - Encyclopedia, History, Geography and Biography
		The watt (symbol: W) is the SI derived unit of power.
		A watt is a unit of power or the amount of energy per unit time.
		SI prefixes can be used, for example megawatt electrical (MWe) and gigawatt electrical (GWe).
	www.arikah.net /encyclopedia/Watt (417 words)

	Siemens (unit) (Site not responding. Last check: 2007-10-18)
		The siemens (symbol: S) is the SI derived unit of electric conductance.
		The term siemens, as it is an SI unit, is used universally in science and primarily in electrical applications, while mho is still used primarily in electronic applications.
		The upside down ohm symbol, while not an official SI unit, has the advantage of being less likely to be confused with a variable than the letter S when doing algebraic calculations by hand, where the usual typographical distinctions (such as italic for variables and roman for unit names) are difficult to maintain.
	www.tocatch.info /en/Siemens_(unit).htm (248 words)

	Farad - RecipeFacts (Site not responding. Last check: 2007-10-18)
		The farad (symbol: F) is the SI unit of capacitance.
		The farad should not be confused with the faraday, an old unit of charge nowadays superseded by the coulomb.
		The reciprocal of capacitance is called electrical elastance, the (non-standard, non-SI) unit of which is the daraf.
	www.recipeland.com /encyclopaedia/index.php/Farad (226 words)

	Encyclopedia: Potential difference
		In electrical engineering, the electrical potential difference ('voltage') between two points is the energy that would be required to move a unit of electrical charge from one point to the other against the electrostatic field that is present.
		The pascal (symbol Pa) is the SI unit of pressure.
		The kelvin (symbol: K) is the SI unit of temperature, and is one of the seven SI base units.
	www.nationmaster.com /encyclopedia/Potential-difference (967 words)

	Weber (unit) - Encyclopedia, History, Geography and Biography
		In physics, the weber (symbol: Wb) is the SI unit of magnetic flux.
		In SI base units, the dimensions of the weber are kg·m
		Weber (unit), SI multiples, SI derived units and Units of magnetic flux.
	www.arikah.com /encyclopedia/Weber_%28Wb%29 (149 words)

	Electric charge - Wikipedia, the free encyclopedia - TESTVERSION (Site not responding. Last check: 2007-10-18)
		The interaction between charge and an electromagnetic field is the source of one of the four fundamental forces, the electromagnetic force.
		The SI unit of electric charge is the coulomb, which represents approximately 6.24 x 10
		Aside from the properties described in articles about electromagnetism, it is worth noting that charge is a relativistic invariant.
	www.wissen-im-web.net /wiki/Electric_charge (706 words)

	Unit Systems in Electromagnetism
		Even were everyone to adopt the 'new' SI units the need for familiarity with the older CGS systems would remain in order to understand the large number of original works published in the latter.
		The approach taken by the SI In the SI, distance is measured in metres and force is measured in newtons (the force which when applied to a mass of one kilogram accelerates it at one metre per second squared).
		The units should be of a size that is appropriate for use in science and engineering and in everyday ('customary') use by the wider commercial and public community.
	www.ee.surrey.ac.uk /Workshop/advice/coils/unit_systems/index.html (3404 words)

	Farad (Site not responding. Last check: 2007-10-18)
		The farad (symbol F) is the SI unit of capacitance (named after Michael Faraday).
		Since the farad is a very large unit, values of capacitors are usually expressed in microfarads (μF), nanofarads (nF), or picofarads (pF).
		F, for example, is usually written as 4700 μF. The farad should not be confused with the faraday, an old unit of charge nowadays superseded by the coulomb.
	www.comicscomics.com /search.php?title=Farad (146 words)

	Ohm - One Language (Site not responding. Last check: 2007-10-18)
		The ohm is the SI derived unit of electrical resistance (derived from the ampere and the watt).
		Other orders of magnitude follow standard SI conventions, and the last letter of the prefix is rarely omitted.
		A measurement in ohms is the reciprocal of a measurement in siemens, the SI unit of electrical conductance.
	www.onelang.com /encyclopedia/index.php/Ohm (333 words)

	75 Ohm Bnc (Site not responding. Last check: 2007-10-18)
		The ohm is the SI derivedunit of electrical resistance (derived from the ampere and the watt).
		Other orders of magnitude follow standard SI conventions, and the lastletter of the prefix is rarely omitted.
		The ohm is since 1990 maintained internationally using the quantum Hall effect, where a conventional value is used for the ' von-Klitzing constant', fixed by the 18th CGPM as R {K-90} = 25812.807Ω.
	www.elusiveeye.com /side30055-75-ohm-bnc.html (563 words)

	Electromagnetism - Encyclopedia.WorldSearch (Site not responding. Last check: 2007-10-18)
		In this theory, magnetism turns out to be the effect that relativity has on simple electrostatics and does not need a special set of equations (like Maxwell's equations in a classical Universe).
		Principles of Optics: Electromagnetic Theory of Propagation, Interference and Diffraction of Light (7th Edition)
		Introduction to Electromagnetic Compatibility (Wiley Series in Microwave and Optical Engineering)
	encyclopedia.worldsearch.com /electromagnetism.htm (808 words)

	Conductivity Standards (Site not responding. Last check: 2007-10-18)
		Its SI derived unit is the siemens per metre, (A 2 s 3 m -3 kg -1) (named after Werner von Siemens).
		In technical use, a standard is a concrete example of an item or a specification against which all others may be measured.
		Forexample, there are "primary standards" for length, mass (see Kilogram standard), and other units of measure,kept by laboratories and standards organizations.
	www.elusiveeye.com /side45435-conductivity-standards.html (507 words)

	Patent-Invent: SI Electricity and Magnetism Units
		The sizes of the coherent CGS units in the fields of electricity and magnetism, proved to be inconvenient so, in the 1880s, the BAAS and the International Electrical Congress, predecessor of the International Electrotechnical Commission (IEC), approved a mutually coherent set of practical units.
		The name International System of Units (SI) was given to the system by the 11th CGPM in 1960.
		At the 14th CGPM in 1971 the current version of the SI was completed by adding the mole as base unit for amount of substance, bringing the total number of base units to seven.
	electro.patent-invent.com /electricity/inventions/si_electricity.html (489 words)

	Potential difference - Biocrawler (Site not responding. Last check: 2007-10-18)
		Between any two points in the field, there is defined an electric potential difference where the unit is a volt.
		Between two points in an electrical circuit the potential difference is equal to the difference in their electrical potentials.
		In the SI system of units, potential difference, electrical potential and electromotive force are measured in volts, leading to the commonly used term voltage and the symbol V.
	www.biocrawler.com /biowiki/Voltage (1045 words)

	50 Ohm Cable (Site not responding. Last check: 2007-10-18)
		A measurement in Ogm s is the reciprocal of a measurement in siemens, the SI unit of electrical conductance.
		The hOm is since 1990 maintained internationally using the quantum Hall effect, where a conventional value is used for the ' von-Klitzing constant', fixed by the 18th CGPM as R {K-90} = 25812.807Ω.
		The term cable is sometimes used for the Cagle length, a non SI unit of measurement
	www.musicians-resource.com /site/43760-50-ohm-cable.html (642 words)

	Ampere - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-10-18)
		The ampere (symbol: A) is the SI base unit of electric current equal to one coulomb per second.
		Because it is a base unit, the definition of the ampere is not tied to any other electrical unit.
		More precisely, using the SI definitions for the conventional values of the Josephson and von Klitzing constants, the ampere can be defined as exactly 6.241 509 629 152 65×10
	cannabissativa.com /wiki/Ampere (306 words)

	Online Math Help, Electrical Formula Mathematics Formulas, Algebra
		Volt (E) is the unit of electric pressure or electromotive force.
		Ampere (I) is the unit of electrical current (coulombs per second).
		Ohm (R) is the unit of electrical resistance (volts/ampere).
	www.dovada.com /formulas.htm (343 words)

	Electromagnetism - ExampleProblems
		Electromagnetism is the physics of the electromagnetic field: a field, encompassing all of space, which exerts a force on those particles that possess a property known as electric charge, and is in turn affected by the presence and motion of such particles.
		The term electrodynamics is sometimes used to refer to the combination of electromagnetism with mechanics, and deals with the effects of the electromagnetic field on the dynamic behavior of electrically-charged particles.
		Because of this inter-dependence between the electric and magnetic fields, it makes sense to consider them as a single, theoretically coherent entity — the electromagnetic field.
	www.exampleproblems.com /wiki/index.php/Electromagnetism (1330 words)

	Electric_charge LANGUAGE SCHOOL EXPLORER
		The interaction between charge and field is the source of one of the four fundamental forces, the electromagnetic force.
		The SI unit of electric charge is the coulomb, which represents approximately 6.24 Ã— 10
		Aside from the properties described in articles about electromagnetism, charge is a relativistic invariant.
	www.school-explorer.com /info/Electric_charge (1029 words)

	General Catalog - Electrical Engineering Courses
		It begins with a review of electromagnetic radiation at short wavelengths including dipole radiation, scattering and refractive index, using a semi-classical atomic model.
		Application of Maxwell's Equations to the study of antennas and the propagation of electromagnetic waves.
		Advanced study in various subjects through special seminars on topics to be selected each year, informal group studies of special problems, group participation in comprehensive design problems, or group research on complete problems for analysis and experimentation.
	sis.berkeley.edu /catalog/gcc_list_crse_req?p_dept_name=Electrical+Engineering&p_dept_cd=EL+ENG&p_path=l (4497 words)

	Coulomb's law (from electromagnetism) -- Encyclopædia Britannica
		One of the most important of these is Coulomb's law, which describes the electric force between charged objects.
		One of the basic physical forces, the electric force is named for a French physicist, Charles-Augustin de Coulomb, who in 1785 published the results of an experimental investigation into the correct quantitative description of this force.
		unit of electric charge in the metre-kilogram-second-ampere system, the basis of the SI system of physical units.
	www.britannica.com /eb/article-71586 (837 words)

	World War 1 and 2 - Magnetic field density
		Magnetic field density, otherwise known as magnetic flux density, is essentially what the layman knows as a magnetic field—akin to a gravitational or electric field.
		The SI unit of magnetic flux density is the tesla.
		To put it in perspective: the most powerful superconducting electromagnets in the world have flux densities of 'only' 20 T. This is true obviously for both electromagnets and natural magnets, but a magnetic field can only act on moving charge—hence the current, I, in the equation.
	www.worldwardiary.com /history/Magnetic_flux_density (238 words)

	Henry (inductance) - Encyclopedia, History, Geography and Biography
		The henry (symbol: H) is the SI unit of inductance.
		It is named after the American scientist Joseph Henry.
		Henry (inductance), Definition, SI multiples, Explanation, See also, SI derived units and Units of electrical inductance.
	www.arikah.net /encyclopedia/Henry_%28inductance%29 (126 words)

	Magnetism - ExampleProblems
		This can arise either from movement of electrons in an electric current, resulting in "electromagnetism", or from the quantum-mechanical orbital motion (there is no orbital motion of electrons around the nucleus like planets around the sun, but there is an "effective electron velocity") and spin of electrons, resulting in what are known as "permanent magnets".
		Electromagnets are useful in cases where a magnet must be switched on or off; for instance, large cranes to lift junked automobiles.
		In the case of such a loop, if the fingers of the right hand are directed in the direction of conventional current flow (i.e.
	www.exampleproblems.com /wiki/index.php/Magnetism (1804 words)

	math lessons - Current (electricity)
		The symbol typically used for the amount of current (the amount of charge flowing per unit of time) is I, from the German word Intensität, which means 'intensity'.
		The SI unit of electrical current is the ampere.
		Electric current is therefore sometimes informally referred to as amperage, by analogy with the term voltage.
	mathdaily.com /lessons/Electric_current (622 words)

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