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Video (00:30 minutes): Shows how a solar cell works based on a simple experiment and explains the theory. The video presents the solar cell as a supplier of power. When illuminated by a lamp, a wind turbine begins to turn. With the aid of a graphic, the flow of current is explained on the basis of the band model of solids and the quantum nature of light. This video is an excerpt from the teaching DVD, "Optik - Eigenschaften des Lichts".
Video (02:10 minutes):
Nuclear fusion is constantly occurring inside the sun, releasing energy in the form of heat and light.
The sun is our greatest and most important source of energy. The video provides an overview of the processes occurring in the sun and explains how the sun?s radiant energy is produced. It then refers to Einstein?s famous formula.
This video is an excerpt from the teaching DVD, "Energiequelle Sonne - gestern - heute - morgen".
Video (00:22 minutes):
Light strikes a concave reflector and ignites a sparkler in the process.
The video shows a light source directed at a concave reflector. The reflected light is concentrated into a focal point. The high temperature of the focal point ignites a sparkler.
The video ends with a concrete application of this physical principle - the solar stove.
This video is an excerpt from the teaching DVD,
"Optik - Eigenschaften des Lichts".