Electromagnetic Induction, Inductance, and Inductors
Online lecture videos recorded by Prof. Darin Acosta
Use of these videos for teaching purposes requires the explicit
consent of Prof. Dain Acosta
- Induced EMF
- Lecture (28:51)
- Phenomenon of induced EMF in a conducting bar and conducting loop pulled through a region containing a magnetic field
- Faraday's Law of Induction
- Lecture (13:25)
- Extending the example of induced EMF in a current loop to Faraday's Law, which says the induced EMF is given by the change in the magnetic flux
- Lenz's Law
- Lecture (14:16)
- Explanation of Lenz's law, covering the direction of the induced current in Faraday's Law. Demonstration of "jumping rings" also included
- Electric Generator
- Lecture (11:16)
- Principle of an electric generator from Faraday's Law, including demo
- Eddy Currents
- Lecture (8:28)
- Description of eddy currents and magnetic braking, including a demonstration
- Connection between the Electric and Magnetic Fields
- Lecture (7:26)
- Faraday's Law as the connection of a time-varying B field generating an electric field
- Superconductivity and the Meissner Effect (optional)
- Lecture (10:25)
- Description of the Meissner effect and a demonstration of a levitating superconducting "train"
- Mutual Inductance
- Lecture (11:12)
- Description of mutual inductance in terms of Faraday's Law
- Self Inductance
- Definition (18:41)
- Self inductance as the induced EMF in a coil from changing the current in the same coil. Also the phenomenon of back EMF and how to calculate the self inductance from the magnetic flux passing through a coil
- Inductance of a Solenoid (6:01)
- Calculation of the self inductance of a solenoid
- Inductance of a Toroid (10:20)
- Calculation of the self inductance of a toroid
- Stored Energy
- LR Circuits
- Lecture (17:39)
- Discussion of the solution for the current in an LR circuit in terms of a new time constant
Copyright Darin Acosta, 2021