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Alexander Fufaev

Videos about electrodynamics

Here you will find 14 free Electrodynamics video lectures.

Video
Level 2 (without higher mathematics)

The 5 Differences Between Parallel and Series Circuit

Die 5 wichtigsten Unterschiede zwischen einer Parallel- und Reihenschaltung von Widerständen oder Leitwerten.

Content of the video
  1. 00:00 Introduction
  2. 00:16 Difference: Connection
  3. 00:47 Difference: Current
  4. 01:21 Difference: Voltage
  5. 02:00 Difference: Resistance
  6. 02:33 Difference: Conductance
Video
Level 3 (with higher mathematics)

Dirac's Delta Function

In this video you will learn what the Dirac delta function is. We also derive its properties and make examples.

Content of the video
  1. What is the delta function good for?
  2. 02:09 Delta function graphically
  3. 02:21 Integral of the delta function at the origin
  4. 03:08 Shifted delta function
  5. 03:41 Integral of the shifted delta function
  6. 04:33 Delta function is symmetric (even)
  7. 05:44 Delta function with a factor
  8. 06:38 Examples
  9. 07:52 Three-dimensional delta function
Video
Level 4 (for physics pros)

Electromagnetic Wave Equation Simply Explained

In this physics video, we first derive the two wave equations for an electromagnetic wave (for the E and B field components) and look at their properties.

Content of the video
  1. 00:00 Maxwell's equations in vacuum
  2. 00:27 Derivation of the EM wave equation
  3. 02:13 Velocity of an electromagnetic wave
  4. 03:17 Structure of the electromagnetic wave equation
  5. 05:00 E- and B-field are perpendicular to wave vector
  6. 07:24 E- and B-field are perpendicular to each other
  7. 08:15 Summary
Video
Level 2 (without higher mathematics)

Lorentz force simply explained in 6 minutes!

In this video you will learn how to determine the direction of the Lorentz force using left/right hand rule and how this force is calculated and related to the centripetal force.

Content of the video
  1. 00:00 What is Lorentz force?
  2. 00:28 Moving charge perpendicular to the magnetic field
  3. 01:12 Determine Lorentz force direction
  4. 02:40 Lorentz force qvB-equation
  5. 04:12 Movement at an angle to the magnetic field
  6. 04:59 Lorentz and centripetal force
  7. 06:20 Determine velocity of the electron
Video
Level 3 (with higher mathematics)

Inductive reactance of a coil briefly explained

Learn what inductive reactance is and how to determine it for a coil (inductor) in an AC circuit.

Content of the video
  1. 00:00 What is inductive reactance?
  2. 00:30 Calculate inductive reactance
  3. 01:32 Example
  4. 01:53 RMS current through the coil
Video
Level 2 (without higher mathematics)

Capacitive reactance of a capacitor briefly explained

In this short video you will learn what the reactance of a capacitor is and how to calculate it.

Content of the video
  1. [00:00] What is the capacitive reactance?
  2. [00:38] Calculate capacitive reactance
  3. [02:01] Example
  4. [02:22] RMS current through the capacitor
Video
Level 2 (without higher mathematics)

Mass Spectrometry. The Basic Principle.

In this physics video, you will learn how a mass spectrometer is constructed and how you can use it to determine the mass of charged particles.

Content of the video
  1. [00:00] Introduction
  2. [00:25] Velocity selector (electric & magnetic force).
  3. [03:20] Derive velocity of particle
  4. [04:24] Derive mass formula
  5. [06:25] Specific charge, neutrons and facts
Video
Level 1 (suitable for all)

Voltage: The Most Basic Explanation From a Physics Point of View

Here you will learn what voltage is, how it is generated by charge separation, how a voltage source can be created, and what voltage has to do with current.

Content of the video
  1. 00:00 Positive and negative electric charge
  2. 01:12 Charge separation generates voltage
  3. 02:58 Voltage is energy per charge
  4. 05:33 Voltage source and electric current
  5. 08:09 Is voltage dangerous?