Ohm (unit) - Factbites

Ohm (unit) - Factbites
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Topic: Ohm (unit)

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	International System of Electrical and Magnetic Units
		Since 1884 the ohm (the legal ohm) was the resistance of a column of mercury with a cross sectional area of 1 square centimeter and a length of 106.0 cm, which was—not incidentally—about 1,000,000,000 cgs units of resistance.
		The international ohm is 1,000,000,000 times the size of the cgs unit of resistance, its volt is 100,000,000 times the cgs unit of potential, its farad is
		A “practical” system is one whose units have magnitudes convenient for the purposes for which they are used, which often leads to their being much bigger than the absolute units on which they are ultimately based.
	www.sizes.com /units/int_ENMsys.htm (383 words)

	Encyclopedia topic: Ohm
		The reciprocal of the ohm is also called the mho (A unit of conductance equal to the reciprocal of an ohm), from ohm written backwards.
		For consistency, impedance, resistance and reactance all have units of ohms.
		This article is about the SI (A tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust; occurs in clay and feldspar and granite and quartz and sand; used as a semiconductor in transistors) derived unit.
	www.absoluteastronomy.com /encyclopedia/o/oh/ohm.htm (407 words)

	definition of ohm
		Ampre, Amp‘re, Ampere, An, And, Area, As, At, Being, By, Called, Centimeters, Circuit, Column, Congress, Constant, Current, Defined, Difference, Electric, Electrical, Equal, Ice, In, International, Is, It, Length, Mass, Measure, Melting, Mercury, Of, Offered, Ohm, One, Potential, Produces, Represented, Resistance, Standard, States, Statute, Substantially, System, Temperature, The, Thus, To, Unit, United, Units, Unvarying, Volt, Which
		The standard unit in the measure of electrical resistance, being the resistance of a circuit in which a potential difference of one volt produces a current of one ampere.
		As thus defined it is called the international ohm.
	www.brainydictionary.com /words/oh/ohm195966.html (234 words)

	siemens
		The siemens unit was one of two units of resistance that competed for acceptance (the other being the B.A. unit of resistance) until the definition of the ohm at the First International Electrical Congress (Paris, 1881), after which the siemens’ unit withered.
		The conductance of a conductor in siemens is the reciprocal of its resistance in ohms; the siemens was formerly known as the mho or reciprocal ohm.
		The advantages of the Siemens unit were that its magnitude was convenient for telegraph engineers and that a high precision standard was fairly easily constructed in the laboratory.
	www.sizes.com /units/siemens.htm (317 words)

	Antenna Tuning Unit (ATU) using the T-Network approch.
		These are all important factors as the unit may be exposed to quite high RF voltages and currents, the last thing you want your ATU doing is suffering from flash over or heating problems.
		If you wish to add antenna or dummy load switching as I did, then you must run 50 Ohm coax between all sockets and switches.
		This picture shows my ATU with the top panel removed, a pair of 50 Ohm dummy load resistors were also removed to show the connector placement (right side behind switch block).
	www.qsl.net /vk3jeg/atu.html (317 words)

	Siemens (unit) : Mho
		The siemens is an SI derived unit of measurement for electric conductance, being the inverse of ohm, named after Werner von Siemens.
		mho is a now archaic name for this unit of electrical conductance, equal to 1/ohm.
	www.fastload.org /mh/Mho.html (317 words)

	A Bright Idea
		When the antenna is tuned to 50-ohms, all four legs are equal, and current nulls across the sensing unit.
		If the antenna is not 50-ohms, that's where the antenna tuning unit (transmatch, for example) comes to the rescue.
		The accompanying PHOTOGRAPH shows the bare-bones unit without enclosure flanked by a basic version in a plastic box from Radio Shack, right, and a deluxe version with switchable LEDs -- one protruding through the front of the chassis, and another recessed inside the enclosure.
	www.arsqrp.com /ars/pages/back_issues/1998_text/0998_text/bright.html (317 words)

	WP3XEN Antenna Tuning Unit
		"Yours Truly" checking the antenna tuning unit (ATU) prior to the day's transmissions.
		The box contains a simple T-network for matching the 66 ohm impedance of the tower to the 50 ohm output impedance of the transmitter while tuning out the reactive component of the tower.
		The round window in the door of the ATU allowed me to view the base current meter and the CCTV camera fed a picture of the meter to a monitor in the construction trailer.
	home.att.net /~k2pg/XENatu.htm (317 words)

	ELSA - NAUTEL Non Directional Beacon
		The 50 Watt output is fed via a 50 ohm coaxial feeder either directly to a suitable automatically tuned Polestar series antenna or via a separate Automatic Antenna Tuning Unit, Model NX 500 TUB, to the customer's existing antenna system.
		A closed loop servo tuning system ensures that the antenna is maintained at series resonance and therefore provides a constant 50 ohm resistive load.
		NX 500TUB (equivalent to FA9782/1) Automatic Antenna Tuning Unit for use with other than Polestar™ Antennas; 004.
	www.nusaweb.com /prod05.htm (317 words)

	Georg Ohm - Open Encyclopedia
		Ohm's name has been incorporated in the terminology of electrical science in Ohm's Law, the proportionality of current and voltage in a resistor, and adopted as the SI unit of resistance, the ohm (symbol Ω).
		Georg Simon Ohm, (March 16, 1789 - July 6, 1854), German physicist, was born in Erlangen and educated at the university there.
		He became professor of mathematics in the Jesuits' college at Cologne in 1817 and in the polytechnic school of Nuremberg in 1833, and in 1852 became professor of experimental physics in the university of Munich, where he later died.
	open-encyclopedia.com /Georg_Ohm (197 words)

	ohm on Encyclopedia.com
		The megohm (1,000,000 ohms) and the milliohm (.001 ohm) are units derived from the ohm.
		ōm [for G. Ohm ], unit of electrical resistance, defined as the resistance in a circuit in which a potential difference of one volt creates a current of one ampere; hence, 1 ohm equals 1 volt/ampere.
		OHM Corporation Reports 4th Qtr EPS of 14 Cents VS 8 Cents in 1995
	www.encyclopedia.com /html/o1/ohm.asp (267 words)

	AllRefer.com - Georg Simon Ohm (Physics, Biography) - Encyclopedia
		The unit of electrical resistance (see ohm) was named for him.
		His study of electric current led to his formulation of the law now known as Ohm's law.
		He also made studies in acoustics and in crystal interference.
	reference.allrefer.com /encyclopedia/O/Ohm-Geor.html (171 words)

	PHYSICAL UNITS - LoveToKnow Article on PHYSICAL UNITS
		The construction of the international ohm or practical unit of resistance involves a knowledge of the specific resistance of mercury.
		A correlation of these units of quantity of heat with the fundamental units of mass, length and time attended the recognition of the fact that heat was a form of energy; and their quantitative relationships followed from the experimental determinations of the so-called " mechanical equivalent of heat," i.e.
		Thirdly, the unit of electromotive force may be defined as equal to the difference of potential between the ends of the unit of resistance when the unit of current flews in it.
	78.1911encyclopedia.org /U/UN/UNITS_PHYSICAL.htm (8315 words)

	SI - a Whatis.com definition - see also: International System of Units
		SI derived units include the hertz, the newton, the pascal (unit of pressure or stress), the ohm, the farad, the joule, the coulomb, the tesla, the lumen, the becquerel, the
		The meter (abbreviation, m) is the SI unit of displacement or length.
		The kilogram (abbreviation, kg) is the SI unit of mass.
	whatis.techtarget.com /definition/0,,sid9_gci523539,00.html (8315 words)

	history of the ampere
		An international conference in London in 1908 decided to leave the international ampere and the international ohm as they were, and make the international volt a derived unit, its value set by its relation to the other two.
		A unit of this size was needed because the size of the units that fell out of the electric equations in cgs units were much too small for everyday use.
		The unit of resistance they defined, however, was made 10
	www.sizes.com /units/ampHist.htm (639 words)

	siemens
		Thus, one siemens is the equivalent of one ohm.
		Siemens Brothers in London, during the manufacture of the Malta to Alexandria cable, which, was, we believe, the first long cable subjected to a system of continuous tests.
		In 1888 Siemens was raised to the rank of nobility by Kaiser Friedrich III (with the addition of von to his name).
	chem.ch.huji.ac.il /~eugeniik/history/siemens.html (2167 words)

	Units: The International System
		units for measurement of electricity: the coulomb (charge), volt (potential), farad (capacitance), ohm (resistance), and siemens (conductance);
		For example, the SI unit of force, the newton, is defined to be the force that accelerates a mass of one kilogram at the rate of one meter per second per second.
		units for measurement of magnetism: the weber (flux), tesla (flux density), and henry (inductance);
	www.unc.edu /~rowlett/units/sipm.html (1012 words)

	American Society of Civil Engineers, Committee on Metrication
		The ohm is the SI unit of resistance of an electrical conductor.
		The hertz is the SI unit of the frequency of a periodic phenomenon.
		Unit symbols are the same whether singular or plural, and a space is left between the numerical value and the symbol.
	users.vnet.net /cmstone/metric/mfacts1.htm (1012 words)

	Head Unit
		The power output from a high power head unit is limited (by battery voltage) to approximately 20 watts per 4 ohm speaker.
		Most head units have 2 power input connections that have to be connected to a 12 volt source.
		Most head units have outputs that are designed for driving 2 to 4 speakers.
	www.bcae1.com /headunit.htm (1692 words)

	International System of Electrical and Magnetic Units
		The 1893 Congress said the international ohm was 1,000,000,000 units of resistance of the cgs electromagnetic system and that it could be represented for practical purposes by a column of mercury 106.
		A “practical” system is one whose units have magnitudes convenient for the purposes for which they are used, which often leads to their being much bigger than the absolute units on which they are ultimately based.
		The absolute units on which the International System was based are those of the cgs electromagnetic system.
	www.sizes.com /units/int_ENMsys.htm (383 words)

	Physics reference: SI units
		The unit ohm is actually represented with a Greek capital letter Omega, but is represented as a capital letter O throughout these pages.
		This is a polynomial-like combination of the eight elementary and supplementary units: kg, m, s, A, K, rad, cd, and sr.
		The most commonly-used composition of more fundamental units that is described as composing the unit.
	www.alcyone.com /max/reference/physics/units.html (383 words)

	Crossword Puzzle Game Number 4981 (Large Grid)
		A unit of resistance equal to a billionth of an ohm.
		A guided missile fired from shipboard against an airborne target.
		A flat-bottomed volcanic crater that was formed by an explosion.
	www.crosswordpuzzlegames.com /puzzles/gl_4981.html (383 words)

	Physics reference: SI units
		The unit ohm is actually represented with a Greek capital letter Omega, but is represented as a capital letter O throughout these pages.
		The composition of base units that comprise the unit in question.
		This is a polynomial-like combination of the eight elementary and supplementary units: kg, m, s, A, K, rad, cd, and sr.
	www.alcyone.com /max/reference/physics/units.html (368 words)

	Encyclopedia: Watt
		The ohm is the SI derived unit of electrical resistance (derived from the ampere and the watt).
		The unit 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 ConfÃ©rence GÃ©nÃ©rale des Poids et Mesures in 1960.
		The coulomb, symbol C, is the SI unit of electric charge, and is defined in terms of the ampere: 1 coulomb is the amount of electric charge (quantity of electricity) carried by a current of 1 ampere flowing for 1 second.
	www.nationmaster.com /encyclopedia/watt (368 words)

	Ohm's law - Wikipedia, the free encyclopedia
		The unit of resistance is the ohm, which is equal to one volt per ampere, or one volt-second per coulomb.
		Ohm's law was probably the most important of the early quantitative descriptions of the physics of electricity.
		The analogy to the Lorentz force is obvious, and in fact Ohm's law can be derived from the Lorentz force and the assumption that there is a drag on the charge carriers proportional to their velocity.
	en.wikipedia.org /wiki/Ohms_Law (2807 words)

	weber - definition by dict.die.net
		It is the quantity of electricity conveyed in one second by the current produced by an electro-motive force of one volt acting in a circuit having a resistance of one ohm, or the quantity transferred by one [* Sc#Ampere's-Law#amp[`e]re *] in one second.
		[From the name of Professor Weber, a German electrician.] (Elec.) The standard unit of electrical quantity, and also of current.
		[From Coulomb, a French physicist and electrican.] (Physics) The standard unit of quantity in electrical measurements.
	dict.die.net /weber (77 words)

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