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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Biology: Ecosystem ecology: Links in the chain
Hank discusses ecosystems, trophic structure, and the flow of energy through food webs. Biology Life is beautiful! From atoms to cells, fro…
VideoFree10 minutes
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Biology: Oxidative phosphorylation and the electron transport chain
How oxidation of co-enzymes like NADH can lead to the production of ATP through oxidative phosphorylation. Biology Life is beautiful! From …
VideoFree16 minutes
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Electrical engineering: Motor controller functions
This video outlines in simple terms why a motor controller is needed and what it does Electrical engineering Learn about electricity, circu…
VideoFree5 minutes
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Biology: New localities lead to new biodiversity
Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, biology is the study of the fascina…
VideoFree11 minutes
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Biology: Conservation and restoration ecology
Hank discusses different types of biodiversity, as well as how biodiversity can be measured, preserved, and restored. Biology Life is beaut…
VideoFree10 minutes
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Organic chemistry: Elimination vs substitution: secondary substrate
Examining which types of reactions secondary alkyl halides can undergo. Organic chemistry Sal and Jay cover topics covered in college organ…
VideoFree12 minutes
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Chemistry: Calorimetry and enthalpy introduction
Today's episode dives into the HOW of enthalpy. How we calculate it, and how we determine it experimentally...even if our determinations he…
VideoFree11 minutes
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Electrical engineering: Summing op-amp
This op-amp circuit outputs the sum of two input voltages. You can do analog arithmetic on signals. Electrical engineering Learn about elec…
VideoFree9 minutes
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Biology: The scientific method
How the scientific method is used to ask questions and test explanations. Biology Life is beautiful! From atoms to cells, from genes to pro…
VideoFree12 minutes
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Biology: 2015 AP Biology free response 6
Fixing a declining snake population. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems…
VideoFree6 minutes
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Cosmology and astronomy: Agriculture and human population
Thinking about how we get Calories from the land limits human population densities Cosmology and astronomy It's a great, big universe out t…
VideoFree13 minutes
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Electrical engineering: Ben Eater's Spider
In this video Karl talks to Ben Eater about his improvements to the Spider bot platform. Electrical engineering Learn about electricity, ci…
VideoFree3 minutes
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Organic chemistry: Fischer projection introduction
How to assign a configuration to a chirality center using a Fischer projection Organic chemistry Sal and Jay cover topics covered in colleg…
VideoFree9 minutes
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Electrical engineering: Sign convention for passive components
The sign convention for passive components defines what we mean by positive and negative voltage and current. Electrical engineering Learn …
VideoFree4 minutes
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Chemistry: More on orbitals and electron configuration
How electron configuration is related to orbitals and the structure of the periodic table. Chemistry Did you know that everything is made o…
VideoFree15 minutes