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Topic: Inductance


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In the News (Mon 19 Aug 19)

  
  Mutual Inductance :: Blocks (SimPowerSystems)
The self-resistance and inductance for winding 1, in ohms (Ω) and henries (H).
The self-resistance and inductance for winding 2, in ohms (Ω) and henries (H).
The self-resistance and inductance in ohms (Ω) and henries (H) for winding 3.
www.mathworks.com /access/helpdesk/help/toolbox/physmod/powersys/ref/mutualinductance.html   (500 words)

  
 Self-Inductance
The self-induction effect is multiplied by the value of inductance, L. ncreasing the value of L increases the amount of voltage that is induced in response to a change in current.
The math symbol for inductance is L. The graphical symbol for an inductor resembles a coil of wire:
One henry is the amount of inductance that is required for generating one volt of induced voltage when the current is changing at the rate of one ampere per second.
www.free-ed.net /sweethaven/ModElec/acee/frm0202.htm   (332 words)

  
  What is inductor? - a definition from Whatis.com - see also: inductance
The inductance is directly proportional to the number ofturns 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, abbreviatedH.
searchsmb.techtarget.com /sDefinition/0,,sid44_gci212339,00.html   (452 words)

  
  Inductance
Inductance is the characteristic of an electrical circuit that opposes the starting, stopping, or a change in value of current.
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.
Inductance has the same effect on current in an electrical circuit as inertia has on the movement of a mechanical object.
www.sayedsaad.com /fundmental/7_Inductance.htm   (557 words)

  
  Spartanburg SC | GoUpstate.com | Spartanburg Herald-Journal
Inductance (or electric inductance) is a measure of the amount of magnetic flux produced for a given electric current.
The SI unit of inductance is the henry (symbol: H), in honour of Joseph Henry.
The symbol L is used for inductance, possibly in honour of the physicist Heinrich Lenz.
www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=inductance   (1113 words)

  
 Inductance   (Site not responding. Last check: 2007-11-02)
Inductance is a measure of the amount of magnetism that can be stored in a body by an electrical current..
Inductance is also defined as the property of a circuit that opposes a change in current.
Reluctance is the reciprocal of inductance multiplied by a constant.
home.earthlink.net /~tdp/inductance.html   (190 words)

  
 Via Inductance
The inductance of a similar structure going only between the top layer trace and the first ground plane was markedly less, presumably due to the much smaller length of that via.
Inductance being nothing more than the temporary storage of energy in the form of a magnetic field, both fields must be calculated to determine the total inductance.
Inductance is calculated for this configuration by assuming a current of 1 Amp flowing through the signal via and the same 1 Amp returning on the inter-plane connection.
www.sigcon.com /Pubs/news/6_04.htm   (2457 words)

  
 inductance
The property of inductance might be described as "when any piece of wire is wound into a coil form it forms an inductance which is the property of opposing any change in current".
Alternatively it could be said "inductance is the property of a circuit by which energy is stored in the form of an electromagnetic field".
The standard value of inductance is the Henry, a large value which like the Farad for capacitance is rarely encountered in electronics today.
www.electronics-tutorials.com /basics/inductance.htm   (1180 words)

  
 UMR EMC LAB: Inductance Calculations   (Site not responding. Last check: 2007-11-02)
The transmission line geometries are cross sections and the values calculated are the inductance per unit length.
In all cases, the current is assumed to flow in the outer surface of the conductors.
The approximate formulas used to calculate the inductance are provided along with restrictions on the relative size of the various parameters.
emclab.umr.edu /new-induct   (133 words)

  
 Inductance
L for inductance was chosen to honor Heinrich Lenz (1804-1865), whose pioneering work in electromagnetic induction was instrumental in the development of the final theory.
Inductance is the resistance of a circuit element to changes in current.
Inductance in a circuit is the analog of mass in a mechanical system.
hypertextbook.com /physics/electricity/inductance   (695 words)

  
 Inductance Measuring Circuit   (Site not responding. Last check: 2007-11-02)
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)

  
 Inductance Measuring Circuit   (Site not responding. Last check: 2007-11-02)
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.
members.tripod.com /michaelgellis/68hc11/ind.html   (511 words)

  
 INDUCTANCE
Given the inductance values of and the coefficient of coupling between two series-connected inductors, solve for mutual inductance, M. Write the formula for the "total inductance" of two inductors connected in series-opposing.
Given the inductance values of and the mutual inductance value between two coils connected in series-aiding, solve for their combined inductance, L
The symbol for inductance is L and the basic unit of inductance is the HENRY (H).
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)

  
 What is 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   (398 words)

  
 Self-Inductance and Inductors
The inductance L is a measure of the size of the "back- emf" that given inductor will induce on itself.
The inductance L depends upon the physical structure of the circuit element and not upon the current or voltage across the inductor - L is a constant.
For most inductors we experimentally measure their inductance L in same way that we determine the resistance R of a resistor by measuring its value.
www.ac.wwu.edu /~vawter/PhysicsNet/Topics/Inductance/Inductance.html   (384 words)

  
 Voltech AT3600 Tests: L2 - Inductance Match   (Site not responding. Last check: 2007-11-02)
Generally, it is not necessary to measure the inductance at the normal operating conditions of the transformer, which could involve, for example, voltage levels of hundreds of volts.
Inductance is always measured as part of a complex impedance, the result being expressed in terms of either a series or parallel equivalent circuit.
Note that, for any given winding, the inductance values for two circuits are not necessarily the same; this should be born in mind when specifying the test limits.
www.voltech.com /transformertesters/at3600/tests/l2.asp?SL=83746e9n   (785 words)

  
 Inductance
Inductance depends entirely upon the physical construction of the circuit, and can only be measured with special laboratory instruments.
Doubling the radius of a coil increases the inductance by a factor of four.
The third factor that affects the inductance of a coil is the length of the coil.
www.tpub.com /neets/book2/2b.htm   (1086 words)

  
 inductance. The Columbia Encyclopedia, Sixth Edition. 2001-05
Similarly, the mutual inductance, M, of two components, one in each of two separate but closely located circuits, determines the emf that each may induce in the other for a given current change.
Inductance is expressed in henrys (for Joseph Henry).
An inductor is a device designed to produce an inductance, e.g., a coil; an ideal inductor, i.e., one having no resistance or capacitance (see impedance), is often called an inductance.
www.bartleby.com /65/in/inductan.html   (185 words)

  
 Mutual Inductance
The fact that a change in the current of one coil affects the current and voltage in the second coil is quantified in the property called mutual inductance.
The induced emf in coil 1 is due to self inductance L. The mutual inductance M can be defined as the proportionalitiy between the emf generated in coil 2 to the change in current in coil 1 which produced it.
The mutual inductance appears in the circuit equations for both the primary and secondary circuits of the transformer.
hyperphysics.phy-astr.gsu.edu /hbase/magnetic/indmut.html   (379 words)

  
 Self-Inductance and Inductive Reactance
Self inductance is defined as the induction of a voltage in a current-carrying wire when the current in the wire itself is changing.
The term inductor is used to describe a circuit element possessing the property of inductance and a coil of wire is a very common inductor.
This equation can also be reorganized to allow the inductance to be calculated when the amount of inducted voltage can be determined and the current frequency is known.
www.ndt-ed.org /EducationResources/CommunityCollege/EddyCurrents/Physics/selfinductance.htm   (875 words)

  
 EETimes.com - Inductance nags, tools lag in 0.13-micron ICs
SAN JOSE, Calif. — Parasitic on-chip inductance is looming as a new challenge as high-end ASICs push toward 0.13 micron and approach frequencies in the gigahertz range.
One place where inductance is a problem today is Sun Microsystems Inc. The company is running into inductance problems with processor designs, but not yet with ASIC designs, said Sunil Joshi, vice president of design automation at Sun's computer resources processor products group.
The classic problem with inductance modeling is that inductance always involves loops, but the return paths cannot be predicted in advance.
www.eetimes.com /story/OEG20010928S0146   (1852 words)

  
 UMR EMC LAB: Inductance Calculations   (Site not responding. Last check: 2007-11-02)
The transmission line geometries are cross sections and the values calculated are the inductance per unit length.
In all cases, the current is assumed to flow in the outer surface of the conductors.
The approximate formulas used to calculate the inductance are provided along with restrictions on the relative size of the various parameters.
emcsun.ece.umr.edu /new-induct   (133 words)

  
 Inductance   (Site not responding. Last check: 2007-11-02)
This is just a thought; it seems to me that it's harder to measure inductance than a lifting force.
Practically speaking, this means that you want to (a) use a thin-walled tube, or (b) choose a projectile that fills the tube, or (c) choose a tube that has as small an inside diameter as possible.
The property of inductance only helps to quantify what happens with varying current, such as ac signals used radios and tuned circuits.
www.oz.net /~coilgun/theory/coilguninductance.htm   (380 words)

  
 Inductance   (Site not responding. Last check: 2007-11-02)
It is important to keep separate the two kinds of inductance,    mutual inductance and    self inductance.
The mutual inductance between two circuits is defined to be the magnetic flux produced in circuit 1 by the current in circuit 2 divided by the current in circuit 2; or to be the flux produced in circuit 2 by the current in circuit 1 divided by the current in circuit 1:
Like the capacitance and the resistance, the inductance of a coil depends only on its geometry and on the materials of which it is made.
maxwell.byu.edu /~spencerr/websumm122/node88.html   (433 words)

  
 Induction and Inductance
One henry is the amount of inductance that is required to generate one volt of induced voltage when the current is changing at the rate of one ampere per second.
Self-inductance, or simply inductance, is the property of a circuit whereby a change in current causes a change in voltage in the same circuit.
In nondestructive testing, inductance is used to generate eddy currents in the test piece.
www.ndt-ed.org /EducationResources/CommunityCollege/EddyCurrents/Physics/inductance.htm   (492 words)

  
 Inductance Formula
The relationship of length to inductance is clearly shown in reference to Coulomb's constant.
Wheeler's formula (for the inductance of an air core solenoid coil) outputs inductance in terms of thousand inches.
The values and units generated in equation (1.5) are accurate to the same degree as Wheeler's formula for inductance since it incorporates Wheeler's formula unchanged.
www.tesla-coil-builder.com /inductance.htm   (279 words)

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