Internal Inductance
Internal Inductance - Related Videos
11:33
Inductance
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2023
Source: Yong P. Chen, PhD, Department of Physics & Astronomy, College of Science, Purdue University, West Lafayette, IN This experiment will use inductive coils to demonstrate the concept of inductor and inductance. Magnetic induction will be demonstrated using a rod magnet inserted into or extracted away from the core of a coil to induce a transient electromotive force (emf) voltage in the coil, measured by a voltmeter. This experiment will also demonstrate the mutual inductance between...
09:18
Internal Standards
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2023
Source: Laboratory of Dr. B. Jill Venton - University of Virginia The goal of many chemical analyses is a quantitative analysis, where the amount of a substance in a sample is determined. In order to accurately calculate the concentration of an unknown from a sample, careful sample preparation is key. Every time a sample is handled or transferred, some of the sample can be lost. There are strategies however, for minimizing sample loss. There are also strategies for coping with sample loss and...
02:00
Internal Energy
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2020
The total of all possible kinds of energy present in a substance is called the internal energy (U), sometimes symbolized as E. Suppose a system with initial internal energy, Uinitial, undergoes a change in energy (transfer of work or heat), and the final internal energy of the system is Ufinal. Change in internal energy equals the difference between Ufinal and Uinitial. Although the values for Ufinal and Uinitial cannot be determined for a system, the first law of thermodynamics only...
10:08
Categories and Inductive Inferences
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2023
Source: Laboratories of Nicholaus Noles and Judith Danovitch—University of Louisville It might be possible for the human brain to keep track of each individual person, place, or thing encountered, but that would be a very inefficient use of time and cognitive resources. Instead, humans develop categories. Categories are mental representations of real things that can be used for a variety of purposes. For example, individuals can use the perceptual features of animals to place them into a given...
14:01
Anesthesia Induction and Maintenance
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2016
Source: Kay Stewart, RVT, RLATG, CMAR; Valerie A. Schroeder, RVT, RLATG. University of Notre Dame, IN The Guide for the Care and Use of Laboratory Animals ("The Guide") states that pain assessment and alleviation are integral components of the veterinary care of laboratory animals. The definition of anesthesia is the loss of feeling or sensation. It is a dynamic event involving changes in anesthetic depth with respect to an animal's metabolism, surgical stimulation, or variations in the...
FAQs
Internal inductance depends on how current is distributed through the conductor rather than only on the conductor’s overall size. That distribution determines where magnetic flux exists inside the conducting material. When the distribution changes, the associated magnetic field and inductive behavior also change, so engineers must consider current distribution when analyzing conductor impedance or transient response.
At higher frequencies, the skin effect shifts current toward the conductor’s surface instead of allowing it to occupy the interior as broadly. This reduces the portion of magnetic flux located within the conductor, causing internal inductance to generally decrease. The frequency dependence is therefore important in high-frequency circuit analysis and transmission-line behavior.
The distinction depends on where the relevant magnetic flux exists. Internal inductance is associated with flux within the current-carrying conductor, whereas external inductance is associated with fields surrounding it. Separating these contributions helps engineers interpret cable impedance and transmission-line characteristics, particularly when changes in frequency alter the current distribution inside the conductor.
A changing internal magnetic field induces a voltage that opposes the change in current. This opposing response is the important circuit consequence of internal inductance: current transients do not behave as though the conductor were purely resistive. Engineers therefore include the effect when examining electromagnetic transients and other situations involving changing current.
The main considerations are current distribution, conductor geometry, and operating frequency. Geometry influences the available path and field arrangement, while frequency can change how deeply current penetrates the conductor through the skin effect. Considering these variables together allows engineers to determine how strongly internal inductance contributes to the behavior of a particular conductor or system.
Engineers account for internal inductance as part of the inductive contribution to cable or transmission-line behavior. They evaluate it alongside the external inductance associated with surrounding fields, while considering conductor geometry, current distribution, and frequency. This approach supports analysis of impedance and helps describe how the line responds under different operating conditions.
Its influence becomes particularly relevant when engineers analyze cable impedance, transmission lines, electromagnetic transients, or high-frequency circuits. In these applications, the conductor’s magnetic response affects how changing current produces voltage and how system behavior varies with frequency. Including internal inductance provides a more complete representation of conductor behavior than considering surrounding magnetic fields alone.