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We put some charge on a capacitor in an RC circuit and observe what happens to the voltage and current. This is called the natural response…

In this video we attach and wire a digital voice recorder to Bit-zee. Electrical engineering Learn about electricity, circuit theory, and i…

Introduction to lipids like fats and phospholipids High school biology Biological macromolecules There's an old saying, "You are what you e…

How to identify meso compounds Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understanding …

How electron configuration is related to orbitals and the structure of the periodic table. Chemistry Did you know that everything is made o…

Sketch exponentials with different time constants Electrical engineering Learn about electricity, circuit theory, and introductory electron…

Earth ​was formed approximately 4.6 billion years ago, likely as the result of a supernova (star explosion). The debris from this explosion…

How to analyze the stereochemistry of the diene in a Diels-Alder reaction Organic chemistry Sal and Jay cover topics covered in college org…

Calculating the pH at the half-equivalence point for the titration of a weak base with HCl. From 2015 AP Chemistry free response 3d. Chemis…

Plates Moving Due to Convection in Mantle Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, yo…

The concept of negative frequency is perplexing, but it makes sense when you think about rotating complex exponentials Electrical engineeri…

Introduction to bacteria. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, biology i…

Definite integral of the product of cosines. The integral of cos(mt) * cos(nt) = 0, except for the special case when m = n. When m = n, the…

Overview of DNA transcription, translation, and replication during mitosis and meiosis. Learn about chromosomes, chromatids, and chromatin.…

A worked example using Le Chatelier's principle to predict how concentrations will shift for different perturbations. Example includes chan…