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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High school biology: Welcome to the reproductive system
High school biology The reproductive system Topic: Science Learn about all the sciences, from physics, chemistry and biology, to cosmology …
VideoFree7 minutes
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Electrical engineering: What is inside a DVD player? (3 of 5)
In this video we explore the control board inside a DVD player. Electrical engineering Learn about electricity, circuit theory, and introdu…
VideoFree3 minutes
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Organic chemistry: Chemical shift
The formula for calculating chemical shift based on a TMS reference signal and spectrophotometer frequency. Organic chemistry Sal and Jay c…
VideoFree6 minutes
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Electrical engineering: Compare the hair dryer motor to the one you can build
In this video we compare our hair dryer motor to the motor we built. Electrical engineering Learn about electricity, circuit theory, and in…
VideoFree2 minutes
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Chemistry: Balancing redox reactions in base
How to balance a redox reaction in base. Chemistry Did you know that everything is made out of chemicals? Chemistry is the study of matter:…
VideoFree14 minutes
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Biology: The nervous system
Hank begins a series of videos on organ systems with a look at the nervous system and all of the things that it is responsible for in the b…
VideoFree12 minutes
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Electrical engineering: Visualizing the Fourier expansion of a square wave
Visualize the Fourier expansion of a square wave. A square wave can be approximated by adding odd harmonics of a sine wave. Electrical engi…
VideoFree4 minutes
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Biology: Community ecology: Feel the love
Hank explores community ecology, the competitive exclusion principle, and how different species can coexist by occupying different niches. …
VideoFree11 minutes
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Electrical engineering: Digital recorder/player connections
In this video we attach and wire a digital voice recorder to Bit-zee. Electrical engineering Learn about electricity, circuit theory, and i…
VideoFree7 minutes
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Chemistry: Entropy: Embrace the chaos
Life is chaos and the universe tends toward disorder. But why? If you think about it, there are only a few ways for things to be arranged i…
VideoFree13 minutes
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Chemistry: Titration roundup
Making sure you fully understand titration curves by comparing the initial pH and pH at equivalence point for different types. Chemistry Di…
VideoFree11 minutes
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Cosmology and astronomy: Detectable civilizations in our galaxy 5
More reasons why we haven't detected anything yet. Cosmology and astronomy It's a great, big universe out there. In this section of Khan Ac…
VideoFree5 minutes
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Biology: Sex-linked traits
Sex-linked traits are associated with genes found on sex chromosomes. In humans, the sex chromosomes are X and Y. Because the X-chromosome …
VideoFree14 minutes
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Chemistry: Titration calculation example
Example of titrating strong acid, hydrochloric acid, with strong base barium hydroxide. How to calculate the unknown concentration when you…
VideoFree8 minutes
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Organic chemistry: Ka and pKa review
A short review of Ka and pKa for students taking organic chemistry Organic chemistry Sal and Jay cover topics covered in college organic ch…
VideoFree3 minutes