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Electrodynamics

Learn about the electromagnetic properties of our universe, for example about electric charges, currents, electromagnetic fields and so on.
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?