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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Electrical engineering: RC step response setup (1 of 3)
The RC step response is an exponential curve. We set up the circuit and create the differential equation we need to solve. We introduce the…
VideoFree9 minutes
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Health and medicine: 5 common flu vaccine excuses
Many people choose to avoid the flu vaccine each year. Review five popular excuses, and how they relate to common misunderstandings about t…
VideoFree8 minutes
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Organic chemistry: Hydrogen deficiency index
How to relate molecular structure with the molecular formula using the hydrogen deficiency index (or number of degrees of unsaturation). Or…
VideoFree9 minutes
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Electrical engineering: Impedance vs frequency
The impedance of capacitors and inductors in a circuit depend on the frequency of the electric signal. The impedance of an inductor is dire…
VideoFree9 minutes
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Biology: Molecular structure of triglycerides (fats)
Understanding how a triglyceride (triacylglycerol) can be formed from a glycerol molecule and three fatty acids. Biology Life is beautiful!…
VideoFree11 minutes
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Health and medicine: What is sinusitis?
Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…
VideoFree9 minutes
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Organic chemistry: Carbocation rearrangement practice
Examples of using hydride and methyl shifts to form more stable carbocation. Organic chemistry Sal and Jay cover topics covered in college …
VideoFree9 minutes
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Health and medicine: Pulmonary abscess
Pulmonary abscesses occur when part of the lung tissue dies (caused by damage or infection) and gets trapped in a layer of hard tissue in t…
VideoFree11 minutes
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Health and medicine: Atherosclerosis - part 2
See how Atherosclerosis (Fat in the blood vessel wall) hardens the arterial wall and makes it harder for blood to flow through. Rishi is a …
VideoFree9 minutes
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Chemistry: Second-order reaction (with calculus)
Deriving the integrated rate law for second order reactions using calculus. How you can graph second order rate data to see a linear relati…
VideoFree7 minutes
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Health and medicine: Routes of drug entry
Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…
VideoFree4 minutes
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Health and medicine: Three types of capillaries
Learn the differences between continuous, fenestrated, and discontinuous capillaries, and how they affect the movement of molecules. Rishi …
VideoFree9 minutes
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Electrical engineering: Spider's stabilizer bar
Electrical engineering Learn about electricity, circuit theory, and introductory electronics. We also have sections that let you get down a…
VideoFree1 minute
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Chemistry: Empirical formula from mass composition
Calculating the empirical formula from the mass percent composition. Chemistry Did you know that everything is made out of chemicals? Chemi…
VideoFree7 minutes
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Chemistry: Sp hybridization
In sp hybridization, the 2s orbital and a 2p orbital hybridize to form two sp orbitals, each consisting of 50% s character and 50% p charac…
VideoFree11 minutes