In this video David shows how to find the total electric potential at a point in space due to multiple charges. Created by David SantoPietro.
In this video David derives the formula to find the power used by a resistor. Created by David SantoPietro.
How a cell can use a molecule's electrochemical gradient to power secondary active transport.
Introduction to electromagnetic waves and the electromagnetic spectrum.
So we know that all matter is made up of atoms, but what is an atom made out of? Chemists describe the structure of atoms using models. This section will cover the Bohr model, photoelectric effect, absorption and emission spectra, quantum numbers, and electron configurations.
Long before the internet people thought about sending information along wires using static electricity. Created by Brit Cruise.
Common elemental building blocks of biological molecules: Carbon, Oxygen, Hydrogen, Nitrogen and Phosphorus.
How elements relate to atoms. The basics of how protons, electrons, and neutrons make up an atom. Created by Sal Khan.
An emf induced by motion relative to a magnetic field is called a motional emf. This is represented by the equation emf = LvB, where L is length of the object moving at speed v relative to the strength of the magnetic field B.
Using Balmer-Rydberg equation to solve for photon energy for n=3 to 2 transition. Solving for wavelength of a line in UV region of hydrogen emission spectrum. Created by Jay.
Mia Epner, who works on security for a US national intelligence agency, explains how cryptography allows for the secure transfer of data online. This video explains 256-bit encryption, public and private keys, SSL & TLS and HTTPS.
Bulk transport: endocytosis, phagocytosis, and pinocytosis.
An overview of the membrane-bound structures that form the endomembrane system in eukaryotic cells.
Structure of the endoplasmic reticulum and Golgi body (Golgi apparatus). Their role in protein secretion. Created by Sal Khan.
The theory of how mitochondria, chloroplasts and other membrane-bound organelles in eukaryotic cell likely arose from a symbiosis between aerobic prokaryotes and host anaerobic eukaryotic ancestors. Developed by Lynn Margulis.
Sal graphs elastic potential energy and kinetic energy for a mass on a spring and compares the total energy when with and without dissipative forces (friction).
Thinking about energy consumption for tilling land. Created by Sal Khan.
This video explains the potential of a capacitor and how they function in a circuit. By David Santo Pietro.
WW2 Encryption is explored with a focus on the Enigma. Read more here. Created by Brit Cruise.
Exploring the relationship between pH and enzyme activity.