The Paleolithic and Neolithic eras of the Stone Age. Created by Sal Khan.
How dielectrics function in circuits. By David Santo Pietro.
Walkthrough of Diffie-Hellman Key Exchange. Created by Brit Cruise.
What happens when there's way more than two holes? Created by David SantoPietro.
Learn about how particles move from an area of greater concentration to an area of lesser concentration through the process of diffusion.
Learn about diffusion, osmosis, and concentration gradients and why these are important to cells. Created by Sal Khan.
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This video shows you how to "hotwire" a digital camera. This video outlines the first step in making our digital camera work in the Bit-zee robot. The required voltage for the camera was determined by adding the1.5 volt AAA batteries (there are three of them) together to get 4.5 volts (because the batteries are wired in series). Since new batteries usually have a voltage that exceeds their marked rating the camera can easily run on the 5 volts that the center terminal of our L298 motor controller provides. Created by Karl Wendt.
In this video we show you how to attach Bit-zee's camera and route the wires. Created by Karl Wendt.
In this video we attach and wire a digital voice recorder to Bit-zee. Created by Karl Wendt.
Introducing the diode as a circuit element. A diode conducts current in one direction but not the other. Created by Willy McAllister.
We solve a diode circuit graphically by plotting a diode i-v curve and resistor to find the intersection. Graphical solution methods are a common way to work with non-linear components like diodes. Created by Willy McAllister.
Our ancestors noticed that when amber was rubbed against fur it attracted small objects...why is this? Created by Brit Cruise.
An overview of what happens when the conditions for Hardy-Weinberg equilibrium are not fulfilled. Created by Sal Khan.
The index of refraction in a material isn't always the same for every wavelength. This is how prisms split white light into so many colors. Created by David SantoPietro.
Using a one-dimensional number line to visualize and calculate distance and displacement. Created by Sal Khan.
An introduction to the difference between distance traveled and displacement. Created by Sal Khan.
Relating angular displacement to distance traveled (or arc length) for a ball traveling in a circle. Derivation of formula for arc length.
What is the best way to distribute our points?
Learn about the Doppler effect and how it explains the change in frequency of a wave when its source and an observer are moving. Created by Sal Khan.