How does TV work Design

A camera is scanning a picture and then broadcasting the signal to a TV set. The TV screen is covered with phosphor which when hit by an electron beam will emit light. After the beam moves on to a new location, the phosphor keeps glowing for some time.

Category

 * Science

Explorations

 * Use the pen tool to draw a picture on the left and watch it being regenerated on the right.
 * Adjust the quality of the phosphor by adjusting the Decay simulation property. A value close to 1, e.g., 0.99 will make the phosphor glow for quite some time. A value of 0.5 will make the phosphor loose its glow quickly. While your video broadcast is going on, explore the consequences of different Decay rates when you edit the video image on the left.
 * Observe the video signal. The little video-signal agent in the small worksheet shows you the video signal. Have a good look at it while the simulation is running and the image on the left is being scanned.

Sample "How does TV work" Lesson Plans

 * PLEASE CONTRIBUTE YOUR LESSON PLAN!

Acknowledgements

 * Simulation was built by Alexander Repenning.