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: Diagnosis, treatment, and prevention of syphilis
Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-p…
VideoFree10 minutes
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Class 12 Physics (India): Half wave rectifiers
How do you convert AC to DC? The circuits that do that are called Rectifiers. Turns out there are different kinds of rectifiers, some simpl…
VideoFree11
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Class 11 Physics (India): Chain rule
The chain rule states that the derivative of f(g(x)) is f'(g(x))⋅g'(x). In other words, it helps us differentiate *composite functions*. Fo…
VideoFree5
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Class 12 Physics (India): Zener diode voltage regulator
A Zener diode can limit the voltage across it, making it a voltage regulator! In this video, let's explore how a Zener diode can be used to…
VideoFree10
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Health and medicine: What is pertussis?
Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…
VideoFree5 minutes
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Class 11 Physics (India): Force vs. time graphs
David explains how to use a force vs. time graph to find the change in momentum and solves an example problem to find the final velocity of…
VideoFree8 minutes
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Health and medicine: TB pathogenesis
Find out exactly how TB causes damage to the lungs. These videos do not provide medical advice and are for informational purposes only. The…
VideoFree12 minutes
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Organic chemistry: Acetals as protecting groups and thioacetals
How acetals are used as protecting groups. Thioacetals are similar to acetals, but form from reaction of an aldehyde with a thiol (not an a…
VideoFree8 minutes
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Chemistry: Calculating internal energy and work example
Worked example calculating the change in internal energy for a gas using the first law of thermodynamics Chemistry Did you know that everyt…
VideoFree7 minutes
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Class 11 Physics (India): Gravitational potential energy at large distances
Learn how to calculate gravitational potential energy when we can no longer assume the gravitational field is uniform. Class 11 Physics (In…
VideoFree5
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Health and medicine: Managing Parkinson's disease with medications
Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-p…
VideoFree10 minutes
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Class 12 Physics (India): Lenz's Law
Lenz's Law - seeing that the magnetic field induced by a current induced by a change in magnetic flux (Faraday's Law) counteracts the chang…
VideoFree6 minutes
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Physics: Proof: S (or entropy) is a valid state variable
Proof that S (or entropy) is a valid state variable. Physics Learn about the basic principles that govern the physical world around us. Sol…
VideoFree16 minutes
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Organic chemistry: Sulfonation
Sulfonation of benzene. Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understanding of basi…
VideoFree10 minutes
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Health and medicine: Hypertrophic cardiomyopathy: Pathophysiology and diagnosis
Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…
VideoFree13 minutes