Inductance | Wikipedia audio article
Channel: wikipedia tts
Date: 02/10/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Inductance


00:01:53 1 History
00:03:31 2 Source of inductance
00:09:52 3 Self-inductance and magnetic energy
00:15:43 4 Inductive reactance
00:20:12 5 Calculating inductance
00:21:03 5.1 Inductance of a straight single wire
00:21:49 5.1.1 Complications of ambiguous definition
00:23:53 5.1.2 Practical formulas
00:28:20 5.2 Mutual inductance of two parallel straight wires
00:28:53 5.3 Mutual inductance of two wire loops
00:33:08 5.4 Derivation
00:39:01 5.5 Self-inductance of a wire loop
00:43:31 5.6 Inductance of a solenoid
00:46:20 5.7 Inductance of a coaxial cable
00:48:35 5.8 Inductance of multilayer coils
00:49:00 5.9 Magnetic cores
00:52:14 6 Mutual inductance
00:52:24 6.1 Derivation of mutual inductance
00:57:23 6.2 Mutual inductance and magnetic field energy
01:06:22 6.3 Coupling coefficient
01:09:00 6.4 Matrix representation
01:10:26 6.5 Equivalent circuits
01:10:35 6.5.1 T-circuit
01:18:44 6.5.2 π-circuit
01:26:56 6.6 Resonant transformer
01:28:38 6.7 Ideal transformers
01:31:54 7 Self-inductance of thin wire shapes
01:35:45 8 See also



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SUMMARY
=======
In electromagnetism and electronics, inductance is the tendency of an electrical conductor to oppose a change in the electric current flowing through it.  The flow of electric current through a conductor creates a magnetic field around the conductor, whose strength depends on the magnitude of the current.  A change in current causes a change in the magnetic field.  From Faraday's law of induction, any change in magnetic field through a circuit induces an electromotive force (EMF) in the conductors; this is known as electromagnetic induction.  So the changing current induces a voltage in the conductor.  This induced voltage is in a direction which tends to oppose the change in current (as stated by Lenz's law), so it is called a back EMF.
Inductance is defined as the ratio of the induced voltage to the rate of change of current causing it.  It is a proportionality factor that depends on the geometry of circuit conductors and the magnetic permeability of nearby materials.  An electronic component designed to add inductance to a circuit is called an inductor.  It typically consists of a coil or helix of wire.
The term inductance was coined by Oliver Heaviside in 1886. It is customary to use the symbol 
  
    
      
        L
      
    
    {\displaystyle L}
   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 that causes a voltage of one 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.