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Topic: Henry (inductance)

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 Henry - Wikipedia, the free encyclopedia
Henry is a male given name and a surname.
Benjamin Tyler Henry (1821–1898), U.S. inventor of the Henry rifle
4 Kings of Castile: Henry I, Henry II the Bastard, Henry III the Infirm, and Henry IV the Impotent
en.wikipedia.org /wiki/Henry   (278 words)

 Henry   (Site not responding. Last check: 2007-10-21)
Dies in Washington, DC Joseph Henry was born to Scottish immigrants in Albany, New York in the 1799.
Henry noted that tourists who viewed it "all appear to be specially interested in knowing the condition of weather to which their friends at home are subjected at the time." He shared the telegraph dispatches with the Washington Evening Star, which, in May 1857, began publishing daily weather conditions at nearly twenty different cities.
Henry apparently envisioned a system of storm warnings, announcing in his annual report for 1857 that he hoped the following year to arrange with telegraph lines "to give warning on the eastern coast of the approach of storms." But he was not able to implement the plan before the Civil War engulfed the nation.
chem.ch.huji.ac.il /~eugeniik/history/henry.html   (5717 words)

 Henry Joseph
Henry found that the self-inductance is greatly affected by the configuration of the circuit, especially the coiling of the wire.
Joseph Henry House) was used to send signals to his wife; this signal system used a remote electromagnet to close a switch for a stronger local circuit, and constituted in effect the invention of the magnetic relay.
Henry was one of the original members of the National Academy of Sciences and served as its second president.
www.electricscotland.com /HISTORY/world/henry_joseph.htm   (1370 words)

 Henry (inductance) - Wikipedia, the free encyclopedia
This SI unit is named after Joseph Henry.
As for all SI units whose names are derived from the proper name of a person, the first letter of its symbol is uppercase (H).
But when an SI unit is spelled out, it should always be written in lowercase (henry), unless it begins a sentence or is the name "degree Celsius".
en.wikipedia.org /wiki/Henry_(inductance)   (156 words)

 Mandeville Gallery at the Nott Memorial
The discovery of inductance and the development of the modern electromagnet are monumental accomplishments in and of themselves, but they are in fact just one small part of a seemingly endless stream of activities and achievements for which Joseph Henry must be credited.
On the bicentennial of Joseph Henry's birth, this exhibition aims to give him some of the recognition he so rightly deserves as one of the most accomplished scientists of his time.
Henry's scientific device and discovery would soon lead to practical applications, such as a magnetic method for the separation of iron ore, the telegraph, the electric motor, the telephone, the electric generator, the transformer, radio, television, the computer, and magnetic resonance imaging.
www.union.edu /gallery/Archives/joseph_henry.htm   (936 words)

Self inductance is a measure of a coil's ability to establish an induced voltage as a result of a change in its current.
The value of inductance can also be changed by changing the number of turns of wire that comprise the coil, but in fact it is not possible in any practical way.
To adjust the inductance value of a hollow coil, the spacing between the loops of the coil is changed.
www.interq.or.jp /japan/se-inoue/e_coil.htm   (1139 words)

Henry also discovered self inductance and mutual inductance (which will be described later in this section) and invented the electromechanical relay (which was the basis for the telegraph).
Inductance is the resistance of a circuit element to changes in current.
The inductance (L) of a circuit element is defined as the ratio of the induced potential (V) to the rate of change of the current (dI/dt).
hypertextbook.com /physics/electricity/inductance/index.shtml   (711 words)

The basic unit of inductance is H henry named after the American physicist Joseph Henry.
Inductance in electrical circuits is similar to inertia in mechanical operations.
When inductance are not coupled (far enough apart to not influence each other) and connected in series the total inductance is the sum of the individual inductances.
wilsonware.com /electronics/inductance.htm   (784 words)

 Henry, Joseph. The Columbia Encyclopedia, Sixth Edition. 2001-05
Henry improved the electromagnet, increasing its strength and fitting it for practical use.
He discovered self-inductance, and the unit of inductance is often called the henry in his honor.
Henry invented a small electromagnetic motor, and extended the work on induced currents to show that an induced current can be used to induce another current in a nearby circuit and that resulting currents in turn can induce others.
www.bartleby.com /65/he/HenryJos.html   (257 words)

 Joseph Henry - CreationWiki   (Site not responding. Last check: 2007-10-21)
Henry observed a large spark that was generated when the circuit was broken, and he deduced the property known as self-inductance.
Henry was too slow to publish his results at the time of completion, and he was unaware of Faraday's work.
Henry was one of the first members of the National Academy of Sciences and served as its second president.
www.nwcreation.net /wiki/index.php?title=Joseph_Henry   (436 words)

 Inductance Measuring Circuit   (Site not responding. Last check: 2007-10-21)
Other advantages to using a series inductance as a calibration inductance is that the circuit is guaranteed to oscillate for any value of test inductance (Ltest) and that the inaccuracies resulting from finite op-amp slew rate are cancelled out, even if the positive going slew rate differs from the negative going slew rate.
The 220 ohm resistor is necessary to discharge the inductor during reversals in the polarity of the output voltage, otherwise a spike appears in the output voltage causing inaccuracies in the measured value of inductance.
For a desired inductance, l, the designer should calculate the number of turns, N, then wind an inductor with a few more than N turns, and gradually back off the number of turns, by measuring the inductance with the test circuit below until the exact inductance is achieved.
michaelgellis.tripod.com /68hc11/ind.html   (511 words)

Firstly, the mutual inductance of two loops is a purely geometric quantity, having to do with the sizes, shapes, and relative orientations of the loops.
Inductance is measured in S.I. units called henries (H): 1 henry is 1 volt-second per ampere.
The henry, like the farad, is a rather unwieldy unit, since most real-life inductors have a inductances of order a micro-henry.
farside.ph.utexas.edu /teaching/em/lectures/node81.html   (356 words)

 Physics.org - Search Results
Joseph Henry (1797-1878) chief scientific contributions were in the field of electromagnetism, where he discovered the phenomenon of self-inductance.
Henry W. Kendall (1926 - 1999) received the Nobel Prize for Physics in 1990 along with Jerome I. Friedman and Richard E. Taylor for their pioneering investigations which have been of essential importance for the development of the quark model in particle physics.
Sir William Henry Bragg (1862 - 1942) and his son Lawrence founded a new branch of science of the greatest importance and significance, the analysis of crystal structure by means of X-rays.
www.physics.org /results/search.asp?q=henry&uu=0   (295 words)

 INDUCTANCE   (Site not responding. Last check: 2007-10-21)
Inductance is the characteristic of an electrical circuit that opposes the starting, stopping, or a change in value of current.
The symbol for inductance is L and the basic unit of inductance is the HENRY (H).
One henry is equal to the inductance required to induce one volt in an inductor by a change of current of one ampere per second.
www.tpub.com /neets/book2/2.htm   (809 words)

 Mutual inductance
is the mutual inductance of circuit 1 with respect to circuit 2.
In other words, the flux linking circuit 2 when a certain current flows around circuit 1 is exactly the same as the flux linking circuit 1 when the same current flows around circuit 2: this is true irrespective of the size, number of turns, relative position, and relative orientation of the two circuits.
The mutual inductances of the circuits typically encountered in laboratory experiments are measured in milli-henries.
farside.ph.utexas.edu /teaching/302l/lectures/node84.html   (565 words)

 inductance articles on Encyclopedia.com   (Site not responding. Last check: 2007-10-21)
inductance INDUCTANCE [inductance] quantity that measures the electromagnetic induction of an electric circuit component; it is a property of the component itself rather than of the circuit as a whole.
Henry, Joseph HENRY, JOSEPH [Henry, Joseph] 1797-1878, American physicist, b.
Ohm's law OHM'S LAW [Ohm's law] [for G. Ohm ], law stating that the electric current i flowing through a given resistance r is equal to the applied voltage v divided by the resistance, or i = v / r.
www.encyclopedia.com /articles/06342.html   (295 words)

Joseph Henry’s discovery of self induction in 1832 was the first appearance of a major US discovery in electricity since Benjamin Franklin.
The unit of inductance was subsequently called "Henry", and that of capacity, "Farad", after Faraday.
Relevant to the controversy between Faraday and Henry is the following statement by A D Bache, Secretary of the American Philosophical Society introducing an abstract of Henry in J Franklyn Inst.
www.sparkmuseum.com /BOOK_HENRY.HTM   (323 words)

 Define henry - a definition from Whatis.com - see also: H
The henry (symbolized H) is the Standard International (SI) unit of inductance.
In a circuit where the current is changing at a constant rate of one ampere per second (A/s), an inductance of 1 H results in the generation of one volt (1 V) of potential difference across an inductor.
The henry is a large unit of inductance.
whatis.techtarget.com /definition/0,,sid9_gci532215,00.html   (256 words)

 Define inductor - a definition from Whatis.com - see also: inductance
The inductance is directly proportional to the number of turns in the coil.
Inductance also depends on the radius of the coil and on the type of material around which the coil is wound.
The standard unit of inductance is the henry, abbreviated H.
whatis.techtarget.com /definition/0,,sid9_gci212339,00.html   (379 words)

 Career - Joseph Henry   (Site not responding. Last check: 2007-10-21)
Joseph Henry (December 17 1797 — May 13 1878) was an United States scientist.
He also discovered mutual inductance, independently of Michael Faraday, but Faraday was the first to publish his results.
The SI unit of inductance, the henry (inductance), is named after him.
mywebpage.netscape.com /Abante3055/joseph-henry-career.html   (96 words)

 Henry - Hutchinson encyclopedia article about Henry   (Site not responding. Last check: 2007-10-21)
SI unit of inductance (the reaction of an electric current against the magnetic field that surrounds it).
One henry is the inductance of a circuit that produces an opposing voltage of one volt when the current changes at one ampere per second.
It started, directly, in the London palace of Henry III, and was the result of a quarrel between the King and his powerful brother-in-law, Simon de Montfort, Earl of Leicester.
encyclopedia.farlex.com /henry   (191 words)

 Electronics Tips: 7-Henry Inductor
When the inductor was placed in a circuit operating at 210Hz, it exhibited inductance of about 12 Henry and when placed in a circuit operating at 1KHz, it exhibited inductance of about 8 Henry.
The inductance is proportional to the slope of the curve.
The bottom line is that the measured value of an inductor may depend on the amplitude of the voltage across it.
www.elexp.com /t_henry.htm   (277 words)

 Frist Campus Center Iconography   (Site not responding. Last check: 2007-10-21)
While at Princeton, Henry continued his electrical experiments and also studied sound, capillary action and ballistics, even as he lectured in subjects such as chemistry, geology, mineralogy, astronomy and architecture.
In 1844, Henry helped investigate a deadly cannon explosion during a demonstration aboard the new U.S.S. Princeton, the most technologically advanced warship of its time, and his inquiries led him to explore the subject of molecular cohesion.
Henry left Princeton in 1846 to become the first secretary of the recently-created Smithsonian Institution, where his enormous energy and intelligence were channeled into driving forward both the organization and the very course of American science.
www.princeton.edu /frist/iconography/i7.shtml   (219 words)

The inductance comes from the capacitor itself (typically 1-2 nH for a SMT capacitor), the interconnecting traces (typically 5 to 20 nH according to the layout), and the lead frame of the IC (typically 4 to 15 nH according to the type of IC package).
For a fixed value of inductance, the effectiveness of the high frequency decoupling network is, therefore, solely dependent on the number of capacitors that you use.
Although the effectiveness of the decoupling at high frequency is dependent on the number of capacitors used (since the inductance is reduced to L/N), the effectiveness of the decoupling at low frequency has nothing to do with the number of capacitors used.
www.hottconsultants.com /techtips/decoupling.html   (1302 words)

 Bill Lawrence   (Site not responding. Last check: 2007-10-21)
Inductance (henry) is another valuable parameter for the sonic evaluation of a pickup but requires some basic understanding of electrodynamics.
Besides inductance, there are other factors that also need to be considered in projecting tone and output of a pickup.
Tone and output mainly depend on the relation between inductance, magnetic strength and the efficiency of the pickup, as well as the relation between the inductance of the pickup and the capacitance of the cable.
www.billlawrence.com /Pages/Pickupology/output_sonic_evaluation.htm   (396 words)

 Henry, Joseph
Henry, Joseph (1797-1878), the leading American scientist after Benjamin Franklin until Willard Gibbs, was a professor at Princeton from 1832 to 1846.
The Trustees also provided $100 ``for the purchase of a new electrical machine &c.'' At that point the College was near bankruptcy and Maclean was trying to institute reforms and build up the faculty.
Another wire from his laboratory in Philosophical Hall to his home on the campus (seeJoseph Henry House) was used to send signals to his wife; this signal system used a remote electromagnet to close a switch for a stronger local circuit, and constituted in effect the invention of the magnetic relay.
etcweb1.princeton.edu /CampusWWW/Companion/henry_joseph.html   (1372 words)

 Producing wound components
inductance of such coils from the dimensions and the number of turns.
inductance which can only be compensated for by increasing the number of turns.
inductance bridges should give a reasonably good idea of the inductance of your coil.
www.ee.surrey.ac.uk /Workshop/advice/coils   (3441 words)

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