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: LED eyes
In this video we create and wire Bit-zee's tri-color LED eyes Electrical engineering Learn about electricity, circuit theory, and introduct…
VideoFree8 minutes
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Electrical engineering: Integral of sin(mt) and cos(mt)
Integrating sin(mt) and cos(mt) over a full period equals zero. Electrical engineering Learn about electricity, circuit theory, and introdu…
VideoFree6 minutes
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Biology: What is a biodiversity hotspot?
What a biodiversity hotspot is, and why these locations are important to preserve. Video by California Academy of Sciences. Biology Life is…
VideoFree6 minutes
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Cosmology and astronomy: Star field and nebula images
Star Field and Nebula Images Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, you'll learn ab…
VideoFree7 minutes
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Health and medicine: Types of neurotransmitters
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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Health and medicine: Bacterial meningitis
Dr. Charles Prober discusses prudent prescribing of antibiotics in the context of bacterial meningitis with 4th year medical student Morgan…
VideoFree12 minutes
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Organic chemistry: Alkyne nomenclature
Rules for naming alkynes (molecules with a carbon-carbon triple bond). Organic chemistry Sal and Jay cover topics covered in college organi…
VideoFree7 minutes
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Organic chemistry: Formation of acetals
How aldehydes react with alcohols via an acid-catalyzed mechanism to form acetals. Organic chemistry Sal and Jay cover topics covered in co…
VideoFree14 minutes
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Organic chemistry: Amide formation from acyl chloride
Amide formation from acyl chloride. Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understan…
VideoFree9 minutes
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Cosmology and astronomy: Detectable civilizations in our galaxy 1
A framework for thinking about how many detectable civilizations are out there. Cosmology and astronomy It's a great, big universe out ther…
VideoFree13 minutes
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Electrical engineering: Install on/off switches
Electrical engineering Learn about electricity, circuit theory, and introductory electronics. We also have sections that let you get down a…
VideoFree9 minutes
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Health and medicine: Lub dub
Ever wonder why the heart sounds the way that it does? Opening and closing of heart valves makes the heart rhythm come alive with its lub d…
VideoFree10 minutes
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Electrical engineering: Integral of sine times cosine
Definite integral of the product of sine and cosine. Integrating sin(mt) * cos(nt) over a full period equals zero for any integer m and n. …
VideoFree4 minutes
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Electrical engineering: LC natural response derivation 2
Starting from the differential equation, we come up with a proposed exponential solution and plug it into the equation. This gives us a cha…
VideoFree10 minutes
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Chemistry: Stoichiometry: Limiting reagent
Stoichiometry problem where we find the limiting reagent and calculate grams of product formed. Chemistry Did you know that everything is m…
VideoFree15 minutes