Khan Academy: Biology: Energy and Enzymes: Introduction to Energy

After an explanatory introduction to sugars and enzyme activity, biochemists discover whether lactase is needed to digest lactose, sucrose, and milk as a whole. High school science lab skills are required for these investigations.

Only 10 percent of an incandescent bulb's energy is used to create light; the remaining 90 percent is heat. In the unit of activities, young chemists examine energy through hands-on activities, videos, discussions, and...

Begin a full lesson on climate change by demonstrating how carbon dioxide gas contributes to increased temperatures. Be aware that pressure inside the antacid-containing bottle in Activity 2 may cause the lid to fly off; keep viewers at...

What is energy, anyway? Use this featurette as an introduction to your middle school energy unit. It successfully touches each of Earth's physical systems, the sun as our main source of energy, and the flow of energy through the food...

Keep calm and half pipe. An exciting simulation teaches pupils about energy transfer from potential to kinetic and thermal as a skater moves through a half pipe or other track. After a brief introduction, scholars can build their own...

An introduction to the concept that energy cannot be created nor destroy, but can only change form. [9:18]

Drive the clouds away from your day with this video. It thoroughly details how photovoltaics work and how clouds prevent us from relying solely on solar as an energy source. Unique knitted-object animation (bunnies, clouds, and all...

What is energy, and why do we need so much of it? Scholars explore the definition of energy as it relates to both conversion and consumption with a video and discussion questions. Part of an energy unit from NOVA, the resource provides a...

This video explores buffer system by using the example of the buffering that occurs in our body to get our blood at a particular pH. [6:19]

Learn a new technique for representing organic molecule structure called line or line-angle diagram. This technique was created by Khan Academy founder, Sal Khan. [7:28]