Recommended Videos For You
Bill uses a replica of the point contact transistor built by Walter Brattain and John Bardeen at Bell Labs. On December 23, 1947 they used this device to amplify the output of a microphone and thus started the microelectronics revolution that changed the world. He describes in detail why a transistor works by highlighting the uniqueness of semiconductors in being able to transfer charge by positive and negative carriers.
Bill explains the essential principles of a lead-acid battery. He shows the inside of motorcycle lead-acid battery, removes the lead and lead-oxide plates and shows how they generate a 2 volt potential difference when placed in sulfuric acid. He explains how the build up of lead sulfate between the plates will make the battery unusable if it discharged completely, which leads him to a description of how to make a deep cycle battery used for collecting solar energy.
Bill uses a bucket of propylene glycol to show how a fiber optic cable works and how engineers send signal across oceans.
A basic demonstration of wireless communication. Includes instructions for creating a simple wireless transmitter using an AM radio as the receiver.
This video discusses the origin of Cardinal Directions (North, South, East and West), the compass and True North vs Magnetic North.
Atmospheric pressure plays an essential role in respiration and the function of many devices, including water pumps, syringes and drinking straws. The video explains pascals and psi and includes a demonstration revealing the presence of atmospheric pressure.
Einstein came to the conclusion that gravity and acceleration were indistinguishable, this was a brilliant leap of imagination that redefined the universe.
In 1910, researcher Thomas Hunt Morgan, discovered the relationship between chromosomes and inherited traits. He accomplished this by studying generations of white and red eyed Drosophila - Fruit Flies. This video explains the basic science behind the discovery.
This video provides an outline for a "kitchen science' investigation designed to replicate T.H. Morgan's famous experiment of 1910. Morgan won the Nobel Prize for his contribution to genetics. This investigation uses the common fruit fly, Drosophila Melanogaster, as its subject.
This video describes how to use your video camera to determine the speed of sound. This is an excellent science fair project. Investigate the relationship between air temperature and the speed of sound.
The powerful procedures possible with modern mathematics are rooted in logic that began thousands of years ago. Thales' Theorem demonstrates one style of early mathematical logic, a logic that is relevant and important today.
This video demonstrates how to construct a simple sound synthesizer using inexpensive electronic components. Support for this project including a circuit diagram can be found at http://hilaroad.com/555
Cartesian Divers - an interesting demonstration of the science behind sinking and floating. The device is easily constructed - a useful classroom demonstration.
The ancient Greeks discovered the relationship between the earth, moon and sun. A great example of the power of the human imagination. This video demonstrates a method used by the ancient Greeks to determine the distance to the sun, a good activity for any astronomy class.
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