Curated OER
Technology at Work 2
Students discover the positive and negative effects of technology. For this technology lesson, students give examples of technology advances from the past few years. Students get into groups and debate whether a particular item has hurt...
Curated OER
Transistor Hunt
Pupils locate transistor devices in school. They explain the importance of transistors.
Other
Lee De Forest, American Inventor: The Complete Lee De Forest
An extensive site covering all aspects of Lee de Forest, his inventions, writings, and personal life. Find drawings and pictures of his audion tube and find out about his legacy, especially in the world of electronics.
Energy for Sustainable Development
Esd Bulgaria: Kids & Energy: Energy Pioneers: Lee De Forest
A profile of Lee de Forest who lived from 1873 to 1961. He was one of the most important inventors of radio and electronic technology, whose inventions touch everyday life.
University of Houston
University of Houston: Engines of Our Ingenuity: Fleming's Electric Valve
Provides background information on the Edison Effect and then discusses Fleming's invention.
Wikimedia
Wikipedia: Lee De Forest
This Wikipedia encyclopedia article on Lee de Forest discusses his life and his invention of the triode (or audion), which laid the foundation for radio.
PBS
Outline of the History of the Transistor: Lee De Forest
Part of a larger site about the history of the transistor, this brief biography of Lee de Forest, the inventor of the audion, includes a QuickTime movie that shows how it worked.
National High Magnetic Field Laboratory
Magnet Academy: Lee De Forest
American inventor Lee De Forest was a pioneer of radio and motion pictures. He received more than 300 patents over the course of his lifetime, the most important of which was for a three-electrode vacuum tube, or triode, that he called...
National High Magnetic Field Laboratory
Magnet Academy: John Ambrose Fleming
John Ambrose Fleming was an electronics pioneer who invented the oscillation valve, or vacuum tube, a device that would help make radios, televisions, telephones and even early electronic computers possible. A brilliant innovator,...
National High Magnetic Field Laboratory
Magnet Academy: Siegmund Loewe
Siegmund Loewe was a German engineer and businessman that developed vacuum tube forerunners of the modern integrated circuit. He pioneered both radio and television broadcasting, and the company he established with his brother, David...
Nobel Media AB
The Nobel Prize: Vacuum Tubes
The Nobel Foundation provides a brief story about the first vacuum tubes used in early electronic devices such as radios and phonographs and even the first computers.
History of Computing Science
History of Computing Science: Eniac
The ENIAC (Electrical Numerical Integrator and Computer)was a large computer based on vacuum tubes and introduced in 1946. This lecture gives a brief presentation of the ENIAC.