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Physics Video Lectures

Here you will find 29 free physics video lectures. These are also great for use at school and university. Do you need a Universaldenker style physics video on a specific topic? Then you can order a physics video.
Video
Level 2 (without higher mathematics)

Hall Effect and a SIMPLE Derivation of The Hall Voltage

Learn what the Hall effect is, how the Hall voltage is generated in a current-carrying bar in a magnetic field, and how this voltage is derived.

Content of the video
1. 00:00 Hall effect: Explanation
2. 02:19 Derivation of the Hall voltage / coefficient
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 3 (with higher mathematics)

How to Solve Linear 2nd Order Differential Equation with Characteristic Polynomial ( + Example)

Learn how to solve 2nd order (in)homogeneous linear differential equations using the exponential ansatz. The DEQ of the harmonic oscillator is solved.

Content of the video
1. [00:00] What is exponential ansatz good for?
2. [00:45] Derivation of the method
3. [03:09] Example: Undamped harmonic oscillator
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)

De-Broglie Wavelength And The Wave-Like Matter

Here you will learn about de Broglie wavelength (matter wavelength), its derivation, an example and how de Broglie wavelength can be expressed with voltage.

Content of the video
1. [00:00] Wave-particle duality
2. [00:46] Derivation of the De Broglie wavelength
3. [02:40] Example
4. [03:35] De Broglie wavelength using voltage
Video
Level 3 (with higher mathematics)

How to Solve Partial Differential Equations with Separation of Variables

Learn how to solve partial differential equations (PDE) with separation of variables (product ansatz). Here we make an example with the one-dimensional wave equation.

Content of the video
1. [00:00] What is Separation of Variables good for?
2. [00:23] Example: Separate 1d wave equation
Video
Level 3 (with higher mathematics)

How to Solve 1st Order Homogeneous Differential Equations (with Separation of Variables)

Here you will learn how to solve 1st order homogeneous linear differential equations using the "separation of variables" solving method.

Content of the video
1. [00:00] What is Separation of Variables good for?
2. [00:39] Derivation of the method
3. [02:25] Example: Decay law
Video
Level 3 (with higher mathematics)

How to Solve 1st Order Inhomogeneous Differential Equations (with Variation of Constants)

Learn how to solve 1st order inhomogeneous linear differential equations using the "variation of constants" (variation of parameters) method.

Content of the video
1. [00:00] What is Variation of Parameters good for?
2. [00:45] Derivation of the method
3. [03:09] Example: RL circuit
Video
Level 3 (with higher mathematics)

Divergence Theorem: The Simplest Explanation Every Physicist Should Know

Learn the Divergence Theorem in only 8 minutes, namely how it links a volume integral with a surface integral.

Content of the video
1. [00:00] Equation
2. [00:05] Surface integral in the Divergence Theorem
3. [04:21] Volume integral in the Divergence Theorem
4. [07:09] Summary
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