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Khan Academy: 2757 products

Khan Academy is an organization on a mission. We're a not-for-profit with the goal of changing education for the better by providing a free world-class education for anyone anywhere. All of the site's resources are available to anyone. It doesn't matter if you are a student, teacher, home-schooler, principal, adult returning to the classroom after 20 years, or a friendly alien just trying to get …

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Health and medicine: Hypertension symptoms and categories

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Learn the most common symptoms (or lack thereof!) and the two major categories of hypertension. Rishi is a pediatric infectious disease phy…

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Class 11 Physics (India): Two masses hanging from a pulley

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In this video David explains how to find the acceleration of two masses hanging from a pulley (using the easy method). Class 11 Physics (In…

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Health and medicine: Catching and spreading the flu

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Find out how the flu spreads from person to person, and who is at the greatest risk of getting complications of the flu. Rishi is a pediatr…

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Class 11 Physics (India): Thermodynamics part 5: Molar ideal gas law problem

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Sal uses the molar version of the ideal gas law to solve for the number of moles in a gas. He also shows how to convert this answer into nu…

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Class 11 Physics (India): 𝘶-substitution intro

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Using u-substitution to find the anti-derivative of a function. Seeing that u-substitution is the inverse of the chain rule. Class 11 Physi…

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Class 12 Physics (India): Kirchhoff's current law

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Kirchhoff's Current Law says the currents flowing into a node must add up to zero. Class 12 Physics (India) It is now time to dive deeper i…

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Health and medicine: Hemoglobin moves O2 and CO2

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Learn the two ways that oxygen moves from the lungs to the tissues, and the three ways that carbon dioxide returns from the tissues to the …

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Physics: Optimal angle for a projectile part 1: Components of initial velocity

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You want a projectile to fly as far as possible, at which angle should you launch it? We'll start with formulas for the initial velocity. P…

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Health and medicine: Pressure in the left heart - part 1

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Watch the pressure in the left heart go up and down with every heart beat! Rishi is a pediatric infectious disease physician and works at K…

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Class 11 Physics (India): How to use the shortcut for solving elastic collisions

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In this video, David solves an example elastic collision problem to find the final velocities using the easier/shortcut approach. Class 11 …

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Electrical engineering: Give Spout some grippy feet

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Electrical engineering Learn about electricity, circuit theory, and introductory electronics. We also have sections that let you get down a…

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Electrical engineering: Motor controller connection to Arduino

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In this video we show you how to determine which wire is which and how to connect them to your Arduino. Electrical engineering Learn about …

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Class 11 Physics (India) - Hindi: Introduction to waves (Hindi)

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Introduction to transverse and longitudinal waves. Class 11 Physics (India) - Hindi To help students who prefer to learn by watching Hindi …

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Class 11 Physics (India): Scientific notation examples

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Scientific notation is a way of writing very large or very small numbers. A number is written in scientific notation when a number between …

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Class 11 Physics (India): What is a function?

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Functions assign a single output for each of their inputs. In this video, we see examples of various kinds of functions. Class 11 Physics (…