Free courses

Welcome to my collection of completely free physics and science courses, created for curious minds, students who want clarity, and anyone tired of equations that come out from nowhere. Each course is designed to be rigorous. Dive in, learn at your own pace, and enjoy high-quality education without the paywalls.

• Physics
  • General Physics
    • The work-energy theorem: Theoretical proof and experimental test
    • How Bernoulli’s Principle Works: Simple Application Explained
    • The Secret of Spherical Mirrors: Why f ≈ R/2
    • Derivation of the Mirror Equation and the Magnification
  • Special Relativity
    • Mastering Special Relativity: A Rigorous Step-by-Step Derivation of the Lorentz Transformation
    • Solving the Twin Paradox - A Rigorous Approach
    • The Triplet Paradox Demystified - Part I
    • The Triplet Paradox Demystified - Part II
    • Bell's spaceship paradox and Born rigidity
    • Einstein’s Cat: A Thought Experiment That Proves Time Dilation Is Universal
• Electronics
  • Complex Numbers and Impedance
  • The Operational Amplifier - Part I
    • What is an op-amp?
    • Linear regime
    • Saturated regime
    • The comparator
    • The voltage follower (unity-gain amplifier)
  • The Operational Amplifier - Part II
    • The non-inverting amplifier
    • The inverting amplifier
    • The non-inverting summing amplifier (non-inverting adder)
    • The inverting summing amplifier (inverting adder)
    • The difference amplifier (subtractor)
    • The differentiator
    • The integrator
  • The Operational Amplifier - Part III
    • The voltage follower revisited
    • The logarithm amplifier
    • The exponential amplifier
    • The superdiode
    • The half-wave rectifier
    • The full-wave rectifier
  • The Operational Amplifier - Part IV
    • Passive filters
    • Active filters
    • The low-pass filter
    • The high-pass filter
    • The band-pass filter
    • The band-stop filter (a.k.a. notch filter)
  • EMG Sensor Circuit
• Trigonometry
  • Trigonometry Demystified - Part I
  • Trigonometry Demystified - Part II
  • Trigonometry Demystified - Part III
• Algebra
  • How To Solve Quadratic Equations
  • How To Solve Cubic Equations
  • How To Intelligently Solve A Rubik's Cube - Part I
  • How To Intelligently Solve A Rubik's Cube - Part II
  • How To Intelligently Solve A Rubik's Cube - Part III
  • How To Intelligently Solve A Rubik's Cube - Part IV
• Analytical Geometry
  • Parabola Tangent Circle Challenge | Beautiful Math Geometry Problem
• ...

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